undum/games/media/js/undum.js

(function () {// -----------------------------------------------------------------------
// Internal Infrastructure Implementations [NB: These have to be
// at the top, because we use them below, but you can safely
// ignore them and skip down to the next section.]
// -----------------------------------------------------------------------

/* Crockford's inherit function */
Function.prototype.inherits = function(Parent) {
  var d = {}, p = (this.prototype = new Parent());
  this.prototype.uber = function(name) {
    if (!(name in d)) d[name] = 0;
    var f, r, t = d[name], v = Parent.prototype;
    if (t) {
      while (t) {
        v = v.constructor.prototype;
        t -= 1;
      }
      f = v[name];
    } else {
      f = p[name];
      if (f == this[name]) {
        f = v[name];
      }
    }
    d[name] += 1;
    r = f.apply(this, Array.prototype.slice.apply(arguments, [1]));
    d[name] -= 1;
    return r;
  };
  return this;
};

// Feature detection

var hasLocalStorage = function() {
  var hasStorage = false;
  try {
    hasStorage = ('localStorage' in window) &&
      window.localStorage !== null &&
      window.localStorage !== undefined;
  }
  catch (err) {
    // Firefox with the "Always Ask" cookie accept setting
    // will throw an error when attempting to access localStorage
    hasStorage = false;
  }
  return hasStorage;
};

/// Animations - you can totally redefine these! Fade in and fade out by default.
/// @param id string or object
var showBlock = function(id) {
  var block = id;
  if (typeof id === "string") {
    var block = document.getElementById(id);
  }
  block.classList.add('show');
  block.classList.remove('hide');
  block.style.display = 'block';
}

var hideBlock = function(id) {
  var block = id; // typeof block === "element"
  if (typeof id === "string") {
    var block = document.getElementById(id);
  }
  if (typeof id === "object") { // probably NodeList
    if (id.length == 0)
      return;
    Array.prototype.forEach.call(id, function(element, index) {
      element.classList.add('hide');
      element.classList.remove('show');
    });
    return;
  }
  if (typeof block.classList === "undefined")
  {
    console.log("Tried to hide an undefined block.");
    console.log(id);
    return;
  }
  block.classList.add('hide');
  block.classList.remove('show');
}

// Assertion

var AssertionError = function(message) {
  this.message = message;
  this.name = AssertionError;
};
AssertionError.inherits(Error);

var assert = function(expression, message) {
  if (!expression) {
    throw new AssertionError(message);
  }
};

// Object extention
var extend = function(out) {
  out = out || {};
  for (var i = 1; i < arguments.length; i++) {
    var obj = arguments[i];

    if (!obj)
      continue;

    for (var key in obj) {
      if (obj.hasOwnProperty(key)) {
        if (typeof obj[key] === 'object')
          extend(out[key], obj[key]);
        else
          out[key] = obj[key];
      }
    }
  }

  return out;
};

// -----------------------------------------------------------------------
// Types for Author Use
// -----------------------------------------------------------------------

/* The game is split into situations, which respond to user
 * choices. Situation is the base type. It has three methods:
 * enter, act and exit, which you implement to perform any
 * processing and output any content. The default implementations
 * do nothing.
 *
 * You can either create your own type of Situation, and add
 * enter, act and/or exit functions to the prototype (see
 * SimpleSituation in this file for an example of that), or you
 * can give those functions in the opts parameter. The opts
 * parameter is an object. So you could write:
 *
 *    var situation = Situation({
 *        enter: function(character, system, from) {
 *            ... your implementation ...
 *        }
 *    });
 *
 * If you pass in enter, act and/or exit through these options,
 * then they should have the same function signature as the full
 * function definitions, below.
 *
 * Note that SimpleSituation, a derived type of Situation, calls
 * passed in enter, act and exit functions AS WELL AS their normal
 * action. This is most often what you want: the normal behavior
 * plus a little extra custom behavior. If you want to override
 * the behavior of a SimpleSituation, you'll have to create a
 * derived type and set the enter, act and/or exit function on
 * their prototypes. In most cases, however, if you want to do
 * something completely different, it is better to derive your
 * type from this type: Situation, rather than one of its
 * children.
 *
 * In addition to enter, exit and act, the following options
 * related to implicit situation selection are available:
 *
 * optionText: a string or a function(character, system,
 *     situation) which should return the label to put in an
 *     option block where a link to this situation can be
 *     chosen. The situation passed in is the situation where the
 *     option block is being displayed.
 *
 * canView: a function(character, system, situation) which should
 *     return true if this situation should be visible in an
 *     option block in the given situation.
 *
 * canChoose: a function(character, system, situation) which should
 *     return true if this situation should appear clickable in an
 *     option block. Returning false allows you to present the
 *     option but prevent it being selected. You may want to
 *     indicate to the player that they need to collect some
 *     important object before the option is available, for
 *     example.
 *
 * tags: a list of tags for this situation, which can be used for
 *     implicit situation selection. The tags can also be given as
 *     space, tab or comma separated tags in a string. Note that,
 *     when calling `getSituationIdChoices`, tags are prefixed with
 *     a hash, but that should not be the case here. Just use the
 *     plain tag name.
 *
 * priority: a numeric priority value (default = 1). When
 *     selecting situations implicitly, higher priority situations
 *     are considered first.
 *
 * frequency: a numeric relative frequency (default = 1), so 100
 *     would be 100 times more frequent. When there are more
 *     options that can be displayed, situations will be selected
 *     randomly based on their frequency.
 *
 * displayOrder: a numeric ordering value (default = 1). When
*     situations are selected implicitly, the results are ordered
*     by increasing displayOrder.
*/
var Situation = function(opts) {
  if (opts) {
    if (opts.enter) this._enter = opts.enter;
    if (opts.act) this._act = opts.act;
    if (opts.exit) this._exit = opts.exit;

    // Options related to this situation being automatically
    // selected and displayed in a list of options.
    this._optionText = opts.optionText;
    this._canView = opts.canView || true;
    this._canChoose = opts.canChoose || true;
    this._priority = (opts.priority !== undefined) ? opts.priority : 1;
    this._frequency =
      (opts.frequency !== undefined) ? opts.frequency : 1;
    this._displayOrder =
      (opts.displayOrder !== undefined) ? opts.displayOrder : 1;

    // Tag are not stored with an underscore, because they are
    // accessed directy. They should not be context sensitive
    // (use the canView function to do context sensitive
    // manipulation).
    if (opts.tags !== undefined) {
      if (Array.isArray(opts.tags)) {
        this.tags = opts.tags;
      } else {
        this.tags = opts.tags.split(/[ \t,]+/);
      }
    } else {
      this.tags = [];
    }
  } else {
    this._canView = true;
    this._canChoose = true;
    this._priority = 1;
    this._frequency = 1;
    this._displayOrder = 1;
    this.tags = [];
  }
};
/* A function that takes action when we enter a situation. The
 * last parameter indicates the situation we have just left: it
 * may be null if this is the starting situation. Unlike the
 * exit() method, this method cannot prevent the transition
 * happening: its return value is ignored. */
Situation.prototype.enter = function(character, system, from) {
  if (this._enter) this._enter(character, system, from);
};
/* A function that takes action when we carry out some action in a
 * situation that isn't intended to lead to a new situation. */
Situation.prototype.act = function(character, system, action) {
  if (this._act) this._act(character, system, action);
};
/* A function that takes action when we exit a situation. The last
 * parameter indicates the situation we are going to. */
Situation.prototype.exit = function(character, system, to) {
  if (this._exit) this._exit(character, system, to);
};
/* Determines whether this situation should be contained within a
 * list of options generated automatically by the given
 * situation. */
Situation.prototype.canView = function(character, system, situation) {
  if (typeof(this._canView) === "function" ) {
    return this._canView(character, system, situation);
  } else {
    return this._canView;
  }
};
/* Determines whether this situation should be clickable within a
 * list of options generated automatically by the given situation. */
Situation.prototype.canChoose = function(character, system, situation) {
  if (typeof(this._canChoose) === "function") {
    return this._canChoose(character, system, situation);
  } else {
    return this._canChoose;
  }
};
/* Returns the text that should be used to display this situation
 * in an automatically generated list of choices. */
Situation.prototype.optionText = function(character, system, situation) {
  if (typeof(this._optionText) === "function") {
    return this._optionText(character, system, situation);
  } else {
    return this._optionText;
  }
};
/* Returns the priority, frequency and displayOrder for this situation,
 * when being selected using `system.getSituationIdChoices`. */
Situation.prototype.choiceData = function(character, system, situation) {
  return {
priority: this._priority,
            frequency: this._frequency,
            displayOrder: this._displayOrder
  };
};

/* A simple situation has a block of content that it displays when
 * the situation is entered. The content must be valid "Display
 * Content" (see `System.prototype.write` for a definition). This
 * constructor has options that control its behavior:
 *
 * heading: The optional `heading` will be used as a section title
 *     before the content is displayed. The heading can be any
 *     HTML string, it doesn't need to be "Display Content". If
 *     the heading is not given, no heading will be displayed. If
 *     a heading is given, and no optionText is specified (see
 *     `Situation` for more information on `optionText`), then the
 *     heading will also be used for the situation's option text.
 *
 * actions: This should be an object mapping action Ids to a
 *     response. The response should either be "Display Content"
 *     to display if this action is carried out, or it should be a
 *     function(character, system, action) that will process the
 *     action.
 *
 * choices: A list of situation ids and tags that, if given, will
 *     be used to compile an implicit option block using
 *     `getSituationIdChoices` (see that function for more details
 *     of how this works). Tags in this list should be prefixed
 *     with a hash # symbol, to distinguish them from situation
 *     ids. If just a single tag or id is needed, it can be passed
 *     in as a string without wrapping into a list.
 *
 * minChoices: If `choices` is given, and an implicit choice block
 *     should be compiled, set this option to require at least
 *     this number of options to be displayed. See
 *     `getSituationIdChoices` for a description of the algorithm by
 *     which this happens. If you do not specify the `choices`
 *     option, then this option will be ignored.
 *
 * maxChoices: If `choices` is given, and an implicit choice block
 *     should be compiled, set this option to require no more than
 *     this number of options to be displayed. See
 *     `getSituationIdChoices` for a description of the algorithm
 *     by which this happens. If you do not specify the `choices`
 *     option, then this option will be ignored.
 *
 * The remaining options in the `opts` parameter are the same as for
 * the base Situation.
 */
var SimpleSituation = function(content, opts) {
  Situation.call(this, opts);
  this.content = content;
  this.heading = opts && opts.heading;
  this.actions = opts && opts.actions;

  this.choices = opts && opts.choices;
  this.minChoices = opts && opts.minChoices;
  this.maxChoices = opts && opts.maxChoices;
};
SimpleSituation.inherits(Situation);
SimpleSituation.prototype.enter = function(character, system, from) {
  if (this.heading) {
    if (typeof(this.heading) === "function") {
      system.writeHeading(this.heading());
    } else {
      system.writeHeading(this.heading);
    }
  }
  if (this._enter) this._enter(character, system, from);
  if (this.content) {
    if (typeof(this.content) === "function") {
      system.write(this.content());
    } else {
      system.write(this.content);
    }
  }
  if (this.choices) {
    var choices = system.getSituationIdChoices(this.choices,
        this.minChoices,
        this.maxChoices);
    system.writeChoices(choices);
  }
};
SimpleSituation.prototype.act = function(character, system, action) {
  var response = this.actions[action];
  try {
    response(character, system, action);
  } catch (err) {
    if (response) system.write(response);
  }
  if (this._act) this._act(character, system, action);
};
SimpleSituation.prototype.optionText = function(character, system, sitn) {
  var parentResult = Situation.prototype.optionText.call(this, character,
      system, sitn);
  if (parentResult === undefined) {
    return this.heading;
  } else {
    return parentResult;
  }
};

/* Instances of this class define the qualities that characters
 * may possess. The title should be a string, and can contain
 * HTML. Options are passed in in the opts parameter. The
 * following options are available.
 *
 * priority - A string used to sort qualities within their
 *     groups. When the system displays a list of qualities they
 *     will be sorted by this string. If you don't give a
 *     priority, then the title will be used, so you'll get
 *     alphabetic order. Normally you either don't give a
 *     priority, or else use a priority string containing 0-padded
 *     numbers (e.g. "00001").
 *
 * group - The Id of a group in which to display this
 *     parameter. The corresponding group must be defined in
 *     your `undum.game.qualityGroups` property.
 *
 * extraClasses - These classes will be attached to the <div> tag
 *     that surrounds the quality when it is displayed. A common
 *     use for this is to add icons representing the quality. In
 *     your CSS define a class for each icon, then pass those
 *     classes into the appropriate quality definitions.
 *
 * One key purpose of QualityDefinition is to format the quality
 * value for display. Quality values are always stored as numeric
 * values, but may be displayed in words or symbols. A number of
 * sub-types of QualityDefinition are given that format their
 * values in different ways.
 */
var QualityDefinition = function(title, opts) {
  var myOpts = extend(opts, {
    priority: title,
    group: null,
    extraClasses: null
  });
  this.title = title;
  this.priority = myOpts.priority;
  this.group = myOpts.group;
  this.extraClasses = myOpts.extraClasses;
};
/* Formats the value (which is always numeric) into the value to
 * be displayed. The result should be HTML (but no tags are
 * needed). If null is returned, then the quality definition will
 * not be displayed, so if you want an empty value return an empty
 * string. */
QualityDefinition.prototype.format = function(character, value) {
  return value.toString();
};

/* A quality that is always displayed as the nearest integer of
 * the current value, rounded down. Options (in the opts
 * parameter) are the same as for QualityDefinition. */
var IntegerQuality = function(title, opts) {
  QualityDefinition.call(this, title, opts);
};
IntegerQuality.inherits(QualityDefinition);
IntegerQuality.prototype.format = function(character, value) {
  return Math.floor(value).toString();
};

/* A quality that displays as an IntegerQuality, unless it is
 * zero, when it is omitted. Options (in the opts * parameter) are
 * the same as for QualityDefinition. */
var NonZeroIntegerQuality = function(title, opts) {
  IntegerQuality.call(this, title, opts);
};
NonZeroIntegerQuality.inherits(IntegerQuality);
NonZeroIntegerQuality.prototype.format = function(character, value) {
  if (value === 0) {
    return null;
  } else {
    return IntegerQuality.prototype.format.call(
      this, character, value
    );
  }
};

/* A quality that displays its full numeric value, including
 * decimal component. This is actually a trivial wrapper around
 * the QualityDefinition class, which formats in the same
 * way. Options (in the opts parameter) are the same as for
 * QualityDefinition. */
var NumericQuality = function(title, opts) {
  QualityDefinition.call(this, title, opts);
};
NumericQuality.inherits(QualityDefinition);

/* A quality that displays its values as one of a set of
 * words. The quality value is first rounded down to the nearest
 * integer, then this value is used to select a word to
 * display. The offset parameter (optionally passed in as part of
 * the opts object) controls what number maps to what word.
 *
 * The following options (in the opts parameter) are available:
 *
 * offset - With offset=0 (the default), the quantity value of 0
 *     will map to the first word, and so on. If offset is
 *     non-zero then the value given will correspond to the first
 *     word in the list. So if offset=4, then the first word in
 *     the list will be used for value=4.
 *
 * useBonuses - If this is true (the default), then values outside
 *     the range of words will be construced from the word and a
 *     numeric bonus. So with offset=0 and five words, the last of
 *     which is 'amazing', a score of six would give 'amazing+1'.
 *     if this is false, then the bonus would be omitted, so
 *     anything beyond 'amazing' is still 'amazing'.
 *
 * Other options are the same as for QualityDefinition.
 */
var WordScaleQuality = function(title, values, opts) {
  var myOpts = extend(opts, {
    offset: null,
    useBonuses: true
  });
  QualityDefinition.call(this, title, opts);
  this.values = values;
  this.offset = myOpts.offset;
  this.useBonuses = myOpts.useBonuses;
};
WordScaleQuality.inherits(QualityDefinition);
WordScaleQuality.prototype.format = function(character, value) {
  var val = Math.floor(value - this.offset);
  var mod = "";
  if (val < 0) {
    mod = val.toString();
    val = 0;
  } else if (val >= this.values.length) {
    mod = "+" + (val - this.values.length + 1).toString();
    val = this.values.length - 1;
  }
  if (!this.useBonuses) mod = "";
  if (this.values[val] === null) return null;
  return this.values[val] + mod; // Type coercion
};

/* A specialization of WordScaleQuality that uses the FUDGE RPG's
 * adjective scale (from 'terrible' at -3 to 'superb' at +3). The
 * options are as for WordScaleQuality. In particular you can use
 * the offset option to control where the scale starts. So you
 * could model a quality that everyone starts off as 'terrible'
 * (such as Nuclear Physics) with an offset of 0, while another that
 * is more common (such as Health) could have an offset of -5 so
 * everyone starts with 'great'.
 */
var FudgeAdjectivesQuality = function(title, opts) {
  WordScaleQuality.call(this, title, [
    "terrible".l(),
    "poor".l(),
    "mediocre".l(),
    "fair".l(),
    "good".l(),
    "great".l(),
    "superb".l()
  ], opts);
  if (!('offset' in opts)) this.offset = -3;
};
FudgeAdjectivesQuality.inherits(WordScaleQuality);

/* An boolean quality that removes itself from the quality list if
 * it has a zero value. If it has a non-zero value, its value
 * field is usually left empty, but you can specify your own
 * string to display as the `onDisplay` parameter of the opts
 * object. Other options (in the opts parameter) are the same as
 * for QualityDefinition. */
var OnOffQuality = function(title, opts) {
  var myOpts = extend(opts, {
    onDisplay: ""
  });
  QualityDefinition.call(this, title, opts);
  this.onDisplay = myOpts.onDisplay;
};
OnOffQuality.inherits(QualityDefinition);
OnOffQuality.prototype.format = function(character, value) {
  if (value) return this.onDisplay;
  else return null;
};

/* A boolean quality that has different output text for zero or
 * non-zero quality values. Unlike OnOffQuality, this definition
 * doesn't remove itself from the list when it is 0. The options
 * are as for QualityDefinition, with the addition of options
 * 'yesDisplay' and 'noDisplay', which contain the HTML fragments
 * used to display true and false values. If not given, these
 * default to 'yes' and 'no'.
 */
var YesNoQuality = function(title, opts) {
  var myOpts = extend(opts,{
    yesDisplay: "yes".l(),
    noDisplay: "no".l()
  });
  QualityDefinition.call(this, title, opts);
  this.yesDisplay = myOpts.yesDisplay;
  this.noDisplay = myOpts.noDisplay;
};
YesNoQuality.inherits(QualityDefinition);
YesNoQuality.prototype.format = function(character, value) {
  if (value) return this.yesDisplay;
  else return this.noDisplay;
};

/* Defines a group of qualities that should be displayed together,
 * under the given optional title. These should be defined in the
 * `undum.game.qualityGroups` parameter. */
var QualityGroup = function(title, opts) {
  var myOpts = extend(opts,{
    priority: title,
    extraClasses: null
  });
  this.title = title;
  this.priority = myOpts.priority;
  this.extraClasses = myOpts.extraClasses;
};

/* A system object is passed into the enter, act and exit
 * functions of each situation. It is used to interact with the
 * UI.
 */
var System = function() {
  this.rnd = null;
  this.time = 0;
};

/* Removes all content from the page, clearing the main content area.
 *
 * If an elementSelector is given, then only that selector will be
 * cleared. Note that all content from the cleared element is removed,
 * but the element itself remains, ready to be filled again using
 * System.write.
 */
System.prototype.clearContent = function(elementSelector) {
  var $element;
  if (elementSelector) $element = document.querySelectorAll(elementSelector);
  if (!$element) $element = document.getElementById("content");
  $element.innerHTML = '';
};

/* Outputs regular content to the page. The content supplied must
 * be valid "Display Content".
 *
 * "Display Content" is any HTML string that begins with a HTML
 * start tag, ends with either an end or a closed tag, and is a
 * valid and self-contained snippet of HTML. Note that the string
 * doesn't have to consist of only one HTML tag. You could have
 * several paragraphs, for example, as long as the content starts
 * with the <p> of the first paragraph, and ends with the </p> of
 * the last. So "<p>Foo</p><img src='bar'>" is valid, but "foo<img
 * src='bar'>" is not.
 *
 * The content goes to the end of the page, unless you supply the
 * optional selector argument. If you do, the content appears
 * after the element that matches that selector.
 */
System.prototype.write = function(content, elementSelector) {
  doWrite(content, elementSelector);
};

/* Outputs the given content in a heading on the page. The content
 * supplied must be valid "Display Content".
 *
 * The content goes to the end of the page, unless you supply the
 * optional selector argument. If you do, the content appears
 * after the element that matches that selector.
 */
System.prototype.writeHeading = function(headingContent, elementSelector) {
  var heading = document.createElement("<h1>");
  heading.innerHTML = headingContent;
  doWrite(heading, elementSelector);
};

/* Outputs regular content to the page. The content supplied must
 * be valid "Display Content".
 *
 * The content goes to the beginning of the page, unless you
 * supply the optional selector argument. If you do, the content
 * appears after the element that matches that selector.
 */
System.prototype.writeBefore = function(content, elementSelector) {
  doWrite(content, elementSelector, 'prepend', 'before');
};

/* Outputs regular content to the page. The content supplied must
 * be valid "Display Content".
 *
 * When a selector is not specified, this behaves identically to
 * System.prototype.write. If you supply a selector, the content
 * appears as a child node at the end of the content of the
 * element that matches that selector.
 */

System.prototype.writeInto = function(content, elementSelector) {
  doWrite(content, elementSelector, 'append', 'append');
};

/* Replaces content with the content supplied, which must be valid
 * "Display Content".
 *
 * When a selector is not specified, this replaces the entire
 * content of the page. Otherwise, it replaces the element matched
 * with the selector. This replaces the entire element, including
 * the matched tags, so ideally the content supplied should fit
 * in its place in the DOM with the same kind of display element.
 */

System.prototype.replaceWith = function(content, elementSelector) {
  doWrite(content, elementSelector, 'replaceWith', 'replaceWith');
};

/* Carries out the given situation change or action, as if it were
 * in a link that has been clicked. This allows you to do
 * procedural transitions. You might have an action that builds up
 * the character's strength, and depletes their magic. When the
 * magic is all gone, you can force a situation change by calling
 * this method. */
System.prototype.doLink = function(code) {
  processLink(code);
};

/* Turns any links that target the given href into plain
 * text. This can be used to remove action options when an action
 * is no longer available. It is used automatically when you give
 * a link the 'once' class. */
System.prototype.clearLinks = function(code) {
  var links = document.querySelectorAll("a[href='" + code + "']");
  Array.prototype.forEach.call(links, function(element, index){
    element.querySelectorAll("span").classList.add("ex_link");
  });
};

/* Given a list of situation ids, this outputs a standard option
 * block with the situation choices in the given order.
 *
 * The contents of each choice will be a link to the situation,
 * the text of the link will be given by the situation's
 * outputText property. Note that the canChoose function is
 * called, and if it returns false, then the text will appear, but
 * the link will not be clickable.
 *
 * Although canChoose is honored, canView and displayOrder are
 * not. If you need to honor these, you should either do so
 * manually, ot else use the `getSituationIdChoices` method to
 * return an ordered list of valid viewable situation ids.
 */
System.prototype.writeChoices = function(listOfIds, elementSelector) {
  if (listOfIds.length === 0) return;

  var currentSituation = getCurrentSituation();
  var $options = document.getElementById("content").querySelectorAll("ul").classList.add("options");
  for (var i = 0; i < listOfIds.length; ++i) {
    var situationId = listOfIds[i];
    var situation = game.situations[situationId];
    assert(situation, "unknown_situation".l({id:situationId}));

    var optionText = situation.optionText(character, this,
        currentSituation);
    if (!optionText) optionText = "choice".l({number:i+1});
    var $option = document.getElementById("content").querySelectorAll("li");
    var $a;
    if (situation.canChoose(character, this, currentSituation)) {
      $a = "<a href='"+situationId+"'>"+optionText+"</a>"
    } else {
      $a = "<span>"+optionText+"</span>";
    }
    $option.innerHTML = $a;
    $options.appendChild($option);
  }
  doWrite($options, elementSelector, 'append', 'after');
};

/* Returns a list of situation ids to choose from, given a set of
 * specifications.
 *
 * This function is a complex and powerful way of compiling
 * implicit situation choices. You give it a list of situation ids
 * and situation tags (if a single id or tag is needed just that
 * string can be given, it doesn't need to be wrapped in a
 * list). Tags should be prefixed with a hash # to differentiate
 * them from situation ids. The function then considers all
 * matching situations in descending priority order, calling their
 * canView functions and filtering out any that should not be
 * shown, given the current state. Without additional parameters
 * the function returns a list of the situation ids at the highest
 * level of priority that has any valid results. So, for example,
 * if a tag #places matches three situations, one with priority 2,
 * and two with priority 3, and all of them can be viewed in the
 * current context, then only the two with priority 3 will be
 * returned. This allows you to have high-priority situations that
 * trump any lower situations when they are valid, such as
 * situations that force the player to go to one destination if
 * the player is out of money, for example.
 *
 * If a minChoices value is given, then the function will attempt
 * to return at least that many results. If not enough results are
 * available at the highest priority, then lower priorities will
 * be considered in turn, until enough situations are found. In
 * the example above, if we had a minChoices of three, then all
 * three situations would be returned, even though they have
 * different priorities. If you need to return all valid
 * situations, regardless of their priorities, set minChoices to a
 * large number, such as `Number.MAX_VALUE`, and leave maxChoices
 * undefined.
 *
 * If a maxChoices value is given, then the function will not
 * return any more than the given number of results. If there are
 * more than this number of results possible, then the highest
 * priority resuls will be guaranteed to be returned, but the
 * lowest priority group will have to fight it out for the
 * remaining places. In this case, a random sample is chosen,
 * taking into account the frequency of each situation. So a
 * situation with a frequency of 100 will be chosen 100 times more
 * often than a situation with a frequency of 1, if there is one
 * space available. Often these frequencies have to be taken as a
 * guideline, and the actual probabilities will only be
 * approximate. Consider three situations with frequencies of 1,
 * 1, 100, competing for two spaces. The 100-frequency situation
 * will be chosen almost every time, but for the other space, one
 * of the 1-frequency situations must be chosen. So the actual
 * probabilities will be roughly 50%, 50%, 100%. When selecting
 * more than one result, frequencies can only be a guide.
 *
 * Before this function returns its result, it sorts the
 * situations in increasing order of their displayOrder values.
 */
System.prototype.getSituationIdChoices = function(listOfOrOneIdsOrTags,
    minChoices, maxChoices)
{
  var datum;
  var i;

  // First check if we have a single string for the id or tag.
  if (Object.prototype.toString.call(listOfOrOneIdsOrTags).replace(/^\[object (.+)\]$/, "$1").toLowerCase() == 'string') {
    listOfOrOneIdsOrTags = [listOfOrOneIdsOrTags];
  }

  // First we build a list of all candidate ids.
  var allIds = {};
  for (i = 0; i < listOfOrOneIdsOrTags.length; ++i) {
    var tagOrId = listOfOrOneIdsOrTags[i];
    if (tagOrId.substr(0, 1) == '#') {
      var ids = getSituationIdsWithTag(tagOrId.substr(1));
      for (var j = 0; j < ids.length; ++j) {
        allIds[ids[j]] = true;
      }
    } else {
      allIds[tagOrId] = true;
    }
  }

  // Filter out anything that can't be viewed right now.
  var currentSituation = getCurrentSituation();
  var viewableSituationData = [];
  for (var situationId in allIds) {
    var situation = game.situations[situationId];
    assert(situation, "unknown_situation".l({id:situationId}));

    if (situation.canView(character, system, currentSituation)) {
      // While we're here, get the selection data.
      var viewableSituationDatum =
        situation.choiceData(character, system, currentSituation);
      viewableSituationDatum.id = situationId;
      viewableSituationData.push(viewableSituationDatum);
    }
  }

  // Then we sort in descending priority order.
  viewableSituationData.sort(function(a, b) {
      return b.priority - a.priority;
      });

  var committed = [];
  var candidatesAtLastPriority = [];
  var lastPriority;
  // In descending priority order.
  for (i = 0; i < viewableSituationData.length; ++i) {
    datum = viewableSituationData[i];
    if (datum.priority != lastPriority) {
      if (lastPriority !== undefined) {
        // We've dropped a priority group, see if we have enough
        // situations so far, and stop if we do.
        if (minChoices === undefined || i >= minChoices) break;
      }
      // Continue to acccumulate more options.
      committed.push.apply(committed, candidatesAtLastPriority);
      candidatesAtLastPriority = [];
      lastPriority = datum.priority;
    }
    candidatesAtLastPriority.push(datum);
  }

  // So the values in committed we're committed to, because without
  // them we wouldn't hit our minimum. But those in
  // candidatesAtLastPriority might take us over our maximum, so
  // figure out how many we should choose.
  var totalChoices = committed.length + candidatesAtLastPriority.length;
  if (maxChoices === undefined || maxChoices >= totalChoices) {
    // We can use all the choices.
    committed.push.apply(committed, candidatesAtLastPriority);
  } else if (maxChoices >= committed.length) {
    // We can only use the commited ones.
    // NO-OP
  } else {
    // We have to sample the candidates, using their relative frequency.
    var candidatesToInclude = maxChoices - committed.length;
    for (i = 0; i < candidatesAtLastPriority.length; ++i) {
      datum = candidatesAtLastPriority[i];
      datum._frequencyValue = this.rnd.random() / datum.frequency;
    }
    candidatesToInclude.sort(function(a, b) {
        return a._frequencyValue - b._frequencyValue;
        });
    var chosen = candidatesToInclude.slice(0, candidatesToInclude);
    committed.push.apply(committed, chosen);
  }

  // Now sort in ascending display order.
  committed.sort(function(a, b) {
      return a.displayOrder - b.displayOrder;
      });

  // And return as a list of ids only.
  var result = [];
  for (i = 0; i < committed.length; ++i) {
    result.push(committed[i].id);
  }
  return result;
};

/* Call this to change the character text: the text in the right
 * toolbar before the qualities list. This text is designed to be
 * a short description of the current state of your character. The
 * content you give should be "Display Content" (see
 * `System.prototype.write` for the definition).
 */
System.prototype.setCharacterText = function(content) {
  var block = document.getElementById("character_text_content");
  var oldContent = block.innerHTML;
  var newContent = augmentLinks(content);
  if (interactive && block.offsetWidth > 0 && block.offsetHeight > 0) {
    hideBlock(block);
    block.innerHTML = newContent;
    showBlock(block);
    showHighlight(block.parent);
  } else {
    block.innerHTML = newContent;
  }
};

/* Call this to change the value of a character quality. Don't
 * directly change quality values, because that will not update
 * the UI. (You can change any data in the character's sandbox
 * directly, however, since that isn't displayed). */
System.prototype.setQuality = function(quality, newValue) {
  var oldValue = character.qualities[quality];
  character.qualities[quality] = newValue;
  if (!interactive) return;

  // Work out how to display the values.
  var newDisplay;
  var qualityDefinition = game.qualities[quality];
  if (qualityDefinition) {
    newDisplay = qualityDefinition.format(character, newValue);
  } else {
    // We shouldn't display qualities that have no definition.
    return;
  }

  // Add the data block, if we need it.
  var qualityBlock = document.getElementById("#q_"+quality);
  if (qualityBlock.length <= 0) {
    if (newDisplay === null) return;
    qualityBlock = addQualityBlock(quality).hide().fadeIn(500);
  } else {
    // Do nothing if there's nothing to do.
    if (oldValue == newValue) return;

    // Change the value.
    if (newDisplay === null) {
      // Remove the block, and possibly the whole group, if
      // it is the last quality in the group.
      var toRemove = null;
      var groupBlock = qualityBlock.parents('.quality_group');
      if (groupBlock.find('.quality').length <= 1) {
        toRemove = groupBlock;
      } else {
        toRemove = qualityBlock;
      }

      toRemove.fadeOut(1000, function() {
          toRemove.remove();
          });
    } else {
      var valBlock = qualityBlock.find("[data-attr='value']");
      valBlock.fadeOut(250, function() {
          valBlock.html(newDisplay);
          valBlock.fadeIn(750);
          });
    }
  }
  showHighlight(qualityBlock);
};

/* Changes a quality to a new value, but also should show a progress bar
 * animation of the change. Removed with the progress bar functionality. */
System.prototype.animateQuality = function(quality, newValue, opts) {
  this.setQuality(quality, newValue);
};

/* The character that is passed into each situation is of this
 * form.
 *
 * The `qualities` data member maps the Ids of each quality to its
 * current value. When implementing enter, act or exit functions,
 * you should consider this to be read-only. Make all
 * modifications through `System.prototype.setQuality`, or
 * `System.prototype.animateQuality`. In your `init` function, you
 * can set these values directly.
 *
 * The `sandbox` data member is designed to allow your code to
 * track any data it needs to. The only proviso is that the data
 * structure should be serializable into JSON (this means it must
 * only consist of primitive types [objects, arrays, numbers,
 * booleans, strings], and it must not contain circular series of
 * references). The data in the sandbox is not displayed in the
 * UI, although you are free to use it to create suitable output
 * for the player..
 */
var Character = function() {
  this.qualities = {};
  this.sandbox = {};
};

/* The data structure holding the content for the game. By default
 * this holds nothing. It is this data structure that is populated
 * in the `.game.js` file. Each element in the structure is
 * commented, below.
 *
 * This should be static data that never changes through the
 * course of the game. It is never saved, so anything that might
 * change should be stored in the character.
 */
var game = {

  // Situations

  /* An object mapping from the unique id of each situation, to
   * the situation object itself. This is the heart of the game
   * specification. */
  situations: {},

  /* The unique id of the situation to enter at the start of a
   * new game. */
  start: "start",

  // Quality display definitions

  /* An object mapping the unique id of each quality to its
   * QualityDefinition. You don't need definitions for every
   * quality, but only qualities in this mapping will be
   * displayed in the character box of the UI. */
  qualities: {},

  /* Qualities can have an optional group Id. This maps those
   * Ids to the group definitions that says how to format its
   * qualities.
   */
  qualityGroups: {},

  // Hooks

  /* This function is called at the start of the game. It is
   * normally overridden to provide initial character creation
   * (setting initial quality values, setting the
   * character-text. This is optional, however, as set-up
   * processing could also be done by the first situation's
   * enter function. If this function is given it should have
   * the signature function(character, system).
   */
  init: null,

  /* This function is called before entering any new
   * situation. It is called before the corresponding situation
   * has its `enter` method called. It can be used to implement
   * timed triggers, but is totally optional. If this function
   * is given it should have the signature:
   *
   * function(character, system, oldSituationId, newSituationId);
   */
  enter: null,

  /* Hook for when the situation has already been carried out
   * and printed. The signature is:
   *
   * function(character, system, oldSituationId, newSituationId);
   */
  afterEnter: null,

  /* This function is called before carrying out any action in
   * any situation. It is called before the corresponding
   * situation has its `act` method called. If this optional
   * function is given it should have the signature:
   *
   * function(character, system, situationId, actionId);
   *
   * If the function returns true, then it is indicating that it
   * has consumed the action, and the action will not be passed
   * on to the situation. Note that this is the only one of
   * these global handlers that can consume the event.
   */
  beforeAction: null,

  /* This function is called after carrying out any action in
   * any situation. It is called after the corresponding
   * situation has its `act` method called. If this optional
   * function is given it should have the signature:
   *
   * function(character, system, situationId, actionId);
   */
  afterAction: null,

  /* This function is called after leaving any situation. It is
   * called after the corresponding situation has its `exit`
   * method called. If this optional function is given it should
   * have the signature:
   *
   * function(character, system, oldSituationId, newSituationId);
   */
  exit: null
};

// =======================================================================

// Code below doesn't form part of the public API for UNDUM, so
// you shouldn't find you need to use it.

// -----------------------------------------------------------------------
// Internal Data
// -----------------------------------------------------------------------

/* The global system object. */
var system = new System();

/* This is the data on the player's progress that gets saved. */
var progress = {
  // A random seed string, used internally to make random
  // sequences predictable.
seed: null,
      // Keeps track of the links clicked, and when.
      sequence: [],
      // The time when the progress was saved.
      saveTime: null
};

/* The Id of the current situation the player is in. */
var current = null;

/* This is the current character. It should be reconstructable
 * from the above progress data. */
var character = null;

/* Tracks whether we're in interactive mode or batch mode. */
var interactive = true;

/* The system time when the game was initialized. */
var startTime;

/* The stack of links, resulting from the last action, still be to
 * resolved. */
var linkStack = null;

// -----------------------------------------------------------------------
// Utility Functions
// -----------------------------------------------------------------------

var getCurrentSituation = function() {
  if (current) {
    return game.situations[current];
  } else {
    return null;
  }
};

var parse = function(str) {
  if (str === undefined) {
    return str;
  } else {
    return parseFloat(str);
  }
};

var parseList = function(str, canBeUndefined) {
  if (str === undefined || str === null) {
    if (canBeUndefined) {
      return undefined;
    } else {
      return [];
    }
  } else {
    return str.split(/[ ,\t]+/);
  }
};

var parseFn = function(str) {
  if (str === undefined) {
    return str;
  } else {
    var fstr = "(function(character, system, situation) {\n" +
      str + "\n})";
    var fn = eval(fstr);
    return fn;
  }
};

var loadHTMLSituations = function() {
  var $htmlSituations = document.querySelectorAll("div.situation");
  Array.prototype.forEach.call($htmlSituations, function($situation){
    var id = $situation.getAttribute("id");
    assert(game.situations[id] === undefined, "existing_situation".l({id:id}));

    var content = $situation.innerHTML;
    var opts = {
      // Situation content
      optionText: $situation.getAttribute("data-option-text"),
      canView: parseFn($situation.getAttribute("data-can-view")),
      canChoose: parseFn($situation.getAttribute("data-can-choose")),
      priority: parse($situation.getAttribute("data-priority")),
      frequency: parse($situation.getAttribute("data-frequency")),
      displayOrder: parse($situation.getAttribute("data-display-order")),
      tags: parseList($situation.getAttribute("data-tags"), false),
      // Simple Situation content.
      heading: $situation.getAttribute("data-heading"),
      choices: parseList($situation.getAttribute("data-choices"), true),
      minChoices: parse($situation.getAttribute("data-min-choices")),
      maxChoices: parse($situation.getAttribute("data-max-choices"))
    };

    game.situations[id] = new SimpleSituation(content, opts);
  });
};


/* Outputs regular content to the page. Used by write and
 * writeBefore, the last two arguments control what jQuery methods
 * are used to add the content.
 */
// TODO: this function can append text, prepend text or replace text in selector with the supplied one.
var doWrite = function(content, selector) {
  continueOutputTransaction();
  var output = augmentLinks(content);
  var element;
  if (selector) element = document.querySelector(selector);
  if (element) {
    // TODO: scroll to the last position
    dimensions = element.getBoundingClientRect();
    console.log(dimensions);
    window.scroll(0,150);
    // TODO: scrollStack[scrollStack.length-1] = scrollPoint;*/
  }
  if (!element) {
    document.getElementById('content').innerHTML = output;
  }
  else {
    element.appendChild(output);
  }
  /* We want to scroll this new element to the bottom of the screen.
   * while still being visible. The easiest way is to find the
   * top edge of the *following* element and move that exactly
   * to the bottom (while still ensuring that this element is fully
   * visible.) */
  /*var nextel = output.last().next();
    var scrollPoint;
    if (!nextel.length) {
    scrollPoint = $("#content").height() + $("#title").height() + 60;
    } else {
    scrollPoint = nextel.offset().top - $(window).height();
    }
    if (scrollPoint > output.offset().top)
    scrollPoint = output.offset().top;
    scrollStack[scrollStack.length-1] = scrollPoint;*/
};

/* Gets the unique id used to identify saved games. */
var getSaveId = function() {
  return 'undum_'+game.id+"_"+game.version;
};

/* Adds the quality blocks to the character tools. */
var showQualities = function() {
  document.getElementById("qualities").innerHTML = '';
  for (var qualityId in character.qualities) {
    addQualityBlock(qualityId);
  }
};

/* Fades in and out a highlight on the given element. */
var showHighlight = function(domElement) {
  var highlight = domElement.querySelector(".highlight");
  if (highlight.length <= 0) {
    highlight = document.createElement("<div></div>").classList.add('highlight');
    domElement.appendChild(highlight);
  }
  showBlock(highlight);
  setTimeout(function() {
    hideBlock(highlight);
  }, 2000);
};

/* Finds the correct location and inserts a particular DOM element
 * fits into an existing list of DOM elements. This is done by
 * priority order, so all elements (existing and new) must have
 * their data-priority attribute set. */
var insertAtCorrectPosition = function(parent, newItem) {
  var newPriority = newItem.getAttribute('data-priority');
  var _children = parent.children;
  if (_children != undefined)
  {
    for (var i = 0; i < _children.length; i++) {
      var child = _children[i];
      if (newPriority < child.getAttribute('data-priority')) {
        child.before(newItem);
        return;
      }
    }
    parent.appendChild(newItem);
  }
};

/* Adds a new group to the correct location in the quality list. */
var addGroupBlock = function(groupId) {
  var groupDefinition = game.qualityGroups[groupId];

  // Build the group div with appropriate heading.
  var groupBlock = document.getElementById("quality_group").cloneNode(true);
  groupBlock.setAttribute("id", "g_"+groupId);
  groupBlock.setAttribute("data-priority", groupDefinition.priority);

  var titleElement = groupBlock.querySelectorAll("[data-attr='title']");
  if (groupDefinition.title) {
    titleElement.innerHTML = groupDefinition.title;
  } else {
    if (titleElement.parentNode != undefined)
    {
      titleElement.parentNode.removeChild(titleElement);
    }
  }

  if (groupDefinition.extraClasses) {
    for (var i = 0; i < groupDefinition.extraClasses.length; i++) {
      groupBlock.addClass(groupDefinition.extraClasses[i]);
    }
  }

  // Add the block to the correct place.
  var qualities = document.getElementById("qualities");
  insertAtCorrectPosition(qualities, groupBlock);
  return groupBlock;
};

/* Adds a new quality to the correct location in the quality list. */
var addQualityBlock = function(qualityId) {
  // Make sure we want to display this quality.
  var qualityDefinition = game.qualities[qualityId];
  if (!qualityDefinition) {
    throw new Error("Can't display a quality that hasn't been defined: "+
        qualityId);
  }

  // Work out how the value should be displayed.
  var name = qualityDefinition.title;
  var val = qualityDefinition.format(
      character, character.qualities[qualityId]
      );
  if (val === null) return null;

  // Create the quality output.
  var qualityBlock = document.getElementById("quality").cloneNode(true);
  qualityBlock.setAttribute("id", "q_"+qualityId);
  qualityBlock.setAttribute("data-priority", qualityDefinition.priority);
  qualityBlock.querySelectorAll("[data-attr='name']").innerHTML = name;
  qualityBlock.querySelectorAll("[data-attr='value']").innerHTML = val;
  if (qualityDefinition.extraClasses) {
    for (var i = 0; i < qualityDefinition.extraClasses.length; i++) {
      qualityBlock.className.add(qualityDefinition.extraClasses[i]);
    }
  }

  // Find or create the group block.
  var groupBlock;
  var groupId = qualityDefinition.group;
  if (groupId) {
    var group = game.qualityGroups[groupId];
    assert(group, "no_group_definition".l({id: groupId}));
    groupBlock = document.getElementById("g_"+groupId);
    if (groupBlock == null || groupBlock.length <= 0) {
      groupBlock = addGroupBlock(groupId);
    }
  }

  // Position it correctly.
  var groupQualityList = groupBlock.querySelectorAll(".qualities_in_group");
  insertAtCorrectPosition(groupQualityList, qualityBlock);
  return qualityBlock;
};

/* Output events are tracked, so we can make sure we scroll
 * correctly. We do this in a stack because one click might cause
 * a chain reaction. Of output events, only when we return to the
 * top level will we do the scroll.
 *
 * However, that leaves the question of where to scroll *to*.
 * (Remember that elements could be inserted anywhere in the
 * document.) Whenever we do a write(), we'll have to update the
 * top (last) stack element to that position.
 */
var scrollStack = [];
var pendingFirstWrite = false;
var startOutputTransaction = function() {
  if (scrollStack.length === 0) {
    pendingFirstWrite = true;
  }
  // The default is "all the way down".
  scrollStack.push(
    document.getElementById("content").offsetHeight + document.getElementById("title").offsetHeight + 60
  );
};
var continueOutputTransaction = function() {
  if (pendingFirstWrite) {
    pendingFirstWrite = false;
    var separator = $("#ui_library #turn_separator").clone();
    separator.removeAttr("id");
    $("#content").append(separator);
  }
};
var endOutputTransaction = function() {
  var scrollPoint = scrollStack.pop();
  if (scrollStack.length === 0 && scrollPoint !== null) {
    if (interactive) {
      window.scroll(0,scrollPoint);
    }
    scrollPoint = null;
  }
};

/* This gets called when a link needs to be followed, regardless
 * of whether it was user action that initiated it. */
var linkRe = /^([a-z0-9_-]+|\.)(\/([0-9a-z_-]+))?$/;
var processLink = function(code) {
  // Check if we should do this now, or if processing is already
  // underway.
  if (linkStack !== null) {
    linkStack.push(code);
    return;
  }

  // Track where we're about to add new content.
  startOutputTransaction();

  // We're processing, so make the stack available.
  linkStack = [];

  // Handle each link in turn.
  processOneLink(code);
  while (linkStack.length > 0) {
    code = linkStack.shift();
    processOneLink(code);
  }

  // We're done, so remove the stack to prevent future pushes.
  linkStack = null;

  // Scroll to the top of the new content.
  endOutputTransaction();

  // We're able to save, if we weren't already.
  document.getElementById("save").setAttribute('disabled', false);
};

/* This gets called to actually do the work of processing a code.
 * When one doLink is called (or a link is clicked), this may set call
 * code that further calls doLink, and so on. This method processes
 * each one, and processLink manages this.
 */
var processOneLink = function(code) {
  var match = code.match(linkRe);
  assert(match, "link_not_valid".l({link:code}));

  var situation = match[1];
  var action = match[3];

  // Change the situation
  if (situation !== '.') {
    if (situation !== current) {
      doTransitionTo(situation);
    }
  } else {
    // We should have an action if we have no situation change.
    assert(action, "link_no_action".l());
  }

  // Carry out the action
  if (action) {
    situation = getCurrentSituation();
    if (situation) {
      if (game.beforeAction) {
        // Try the global act handler, and see if we need
        // to notify the situation.
        var consumed = game.beforeAction(
            character, system, current, action
            );
        if (consumed !== true) {
          situation.act(character, system, action);
        }
      } else {
        // We have no global act handler, always notify
        // the situation.
        situation.act(character, system, action);
      }
      if (game.afterAction) {
        game.afterAction(character, system, current, action);
      }
    }
  }
};

/* This function listens on content block to filter out link clicks. */
var linkClickHandler = function(event) {
  if (event.target.tagName.toLowerCase() === 'a') {
    event.preventDefault();
    processClick(event.target.href);
  }
}

/* This gets called when the user clicks a link to carry out an
 * action. */
var processClick = function(code) {
  var now = (new Date()).getTime() * 0.001;
  system.time = now - startTime;
  progress.sequence.push({link:code, when:system.time});
  return processLink(code);
};

/* Transitions between situations. */
var doTransitionTo = function(newSituationId) {
  var oldSituationId = current;
  var oldSituation = getCurrentSituation();
  var newSituation = game.situations[newSituationId];

  assert(newSituation, "unknown_situation".l({id:newSituationId}));

  // We might not have an old situation if this is the start of
  // the game.
  if (oldSituation) {
    // Notify the exiting situation.
    oldSituation.exit(character, system, newSituationId);
    if (game.exit) {
      game.exit(character, system, oldSituationId, newSituationId);
    }
  }

  //  Remove links and transient sections.
  var content = document.getElementById("content");
  links = content.querySelectorAll("a");
  Array.prototype.forEach.call(links, function(element, index) {
    var a = element;
    if (a.classList.contains('sticky') || a.getAttribute("href").match(/[?&]sticky[=&]?/))
      return;
    if (a.getAttribute("href").match(/[?&]transient[=&]?/)) {
      hideBlock(a);
    }
    a.innerHTML = "<span class='ex_link'>"+a.innerHTML+"</span>";
  });
  hideBlock(content.querySelectorAll(".transient"));
  hideBlock(content.querySelectorAll("ul.options"));

  // Move the character.
  current = newSituationId;

  // Notify the incoming situation.
  if (game.enter) {
    game.enter(character, system, oldSituationId, newSituationId);
  }
  newSituation.enter(character, system, oldSituationId);

  // additional hook for when the situation text has already been printed
  if (game.afterEnter) {
    game.afterEnter(character, system, oldSituationId, newSituationId);
  }
};

/* Returns HTML from the given content with the non-raw links
 * wired up. 
 * @param content string HTML code 
 * @retval string */
var augmentLinks = function(content) {
  // Wire up the links for regular <a> tags.
  output = document.createElement('div');
  output.innerHTML = content;
  var links = output.querySelectorAll("a");
  Array.prototype.forEach.call(links, function(element, index){
    var href = element.getAttribute('href');
    if (!element.classList.contains("raw")|| href.match(/[?&]raw[=&]?/)) {
      if (href.match(linkRe)) {
        element.onclick = function(event) {
          event.preventDefault();

          // If we're a once-click, remove all matching links.
          if (element.classList.contains("once") || href.match(/[?&]once[=&]?/)) {
            system.clearLinks(href);
          }

          processClick(href);
          return false;
        };
      } else {
        element.classList.add("raw");
      }
    }
  });

  return output.innerHTML;
};

/* Erases the character in local storage. This is permanent! */
var doErase = function(force) {
  var saveId = getSaveId();
  if (localStorage[saveId]) {
    if (force || confirm("erase_message".l())) {
      delete localStorage[saveId];
      document.getElementById("erase").setAttribute('disabled', true);
      startGame();
    }
  }
};

/* Find and return a list of ids for all situations with the given tag. */
var getSituationIdsWithTag = function(tag) {
  var result = [];
  for (var situationId in game.situations) {
    var situation = game.situations[situationId];

    for (var i = 0; i < situation.tags.length; ++i) {
      if (situation.tags[i] == tag) {
        result.push(situationId);
        break;
      }
    }
  }
  return result;
};

/* Set up the screen from scratch to reflect the current game
 * state. */
var initGameDisplay = function() {
  // Transition into the first situation,
  document.getElementById("content").innerHTML = "";

  var situation = getCurrentSituation();
  assert(situation, "no_current_situation".l());

  showQualities();
};

/* Clear the current game output and start again. */
var startGame = function() {
  progress.seed = new Date().toString();

  character = new Character();
  system.rnd = new Random(progress.seed);
  progress.sequence = [{link:game.start, when:0}];

  // Empty the display
  document.getElementById("content").innerHTML = '';

  // Start the game
  startTime = new Date().getTime() * 0.001;
  system.time = 0;
  if (game.init) game.init(character, system);
  showQualities();

  // Do the first state.
  doTransitionTo(game.start);
};

/* Saves the character to local storage. */
var saveGame = function() {
  // Store when we're saving the game, to avoid exploits where a
  // player loads their file to gain extra time.
  var now = (new Date()).getTime() * 0.001;
  progress.saveTime = now - startTime;

  // Save the game.
  localStorage[getSaveId()] = JSON.stringify(progress);

  // Switch the button highlights.
  document.getElementById("erase").setAttribute('disabled', false);
  document.getElementById("save").setAttribute('disabled', true);
};

/* Loads the game from the given data */
var loadGame = function(characterData) {
  progress = characterData;

  character = new Character();
  system.rnd = new Random(progress.seed);

  // Empty the display
  document.getElementById("content").innerHTML = "";
  showQualities();

  // Now play through the actions so far:
  if (game.init) game.init(character, system);

  // Run through all the player's history.
  interactive = false;
  for (var i = 0; i < progress.sequence.length; i++) {
    var step = progress.sequence[i];
    // The action must be done at the recorded time.
    system.time = step.when;
    processLink(step.link);
  }
  interactive = true;

  // Reverse engineer the start time.
  var now = new Date().getTime() * 0.001;
  startTime = now - progress.saveTime;

  // Because we did the run through non-interactively, now we
  // need to update the UI.
  showQualities();
};

// Internationalization support based on the code provided by Oreolek.
(function() {
 var codesToTry = {};
 /* Compiles a list of fallback languages to try if the given code
  * doesn't have the message we need. Caches it for future use. */
 var getCodesToTry = function(languageCode) {
 var codeArray = codesToTry[languageCode];
 if (codeArray) return codeArray;

 codeArray = [];
 if (languageCode in undum.language) {
 codeArray.push(languageCode);
 }
 var elements = languageCode.split('-');
 for (var i = elements.length-2; i > 0; i--) {
 var thisCode = elements.slice(0, i).join('-');
 if (thisCode in undum.language) {
 codeArray.push(thisCode);
 }
 }
 codeArray.push("");
 codesToTry[languageCode] = codeArray;
 return codeArray;
 };
 var lookup = function(languageCode, message) {
   var languageData = undum.language[languageCode];
   if (!languageData) return null;
   return languageData[message];
 };
 var localize = function(languageCode, message) {
   var localized, thisCode;
   var languageCodes = getCodesToTry(languageCode);
   for (var i = 0; i < languageCodes.length; i++) {
     thisCode = languageCodes[i];
     localized = lookup(thisCode, message);
     if (localized) return localized;
   }
   return message;
 };

 // API
 String.prototype.l = function(args) {
   // Get lang attribute from html tag.
   var lang = document.querySelector("html").getAttribute("lang") || "";

   // Find the localized form.
   var localized = localize(lang, this);

   // Merge in any replacement content.
   if (args) {
     for (var name in args) {
       localized = localized.replace(
           new RegExp("\\{"+name+"\\}"), args[name]
           );
     }
   }
   return localized;
 };
})();

// Random Number generation based on seedrandom.js code by David Bau.
// Copyright 2010 David Bau, all rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the following
// conditions are met:
//
//   1. Redistributions of source code must retain the above
//      copyright notice, this list of conditions and the
//      following disclaimer.
//
//   2. Redistributions in binary form must reproduce the above
//      copyright notice, this list of conditions and the
//      following disclaimer in the documentation and/or other
//      materials provided with the distribution.
//
//   3. Neither the name of this module nor the names of its
//      contributors may be used to endorse or promote products
//      derived from this software without specific prior written
//      permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
var Random = (function() {
  // Within this closure function the code is basically
  // David's. Undum's custom extensions are added to the
  // prototype outside of this function.
  var width = 256;
  var chunks = 6;
  var significanceExponent = 52;
  var startdenom = Math.pow(width, chunks);
  var significance = Math.pow(2, significanceExponent);
  var overflow = significance * 2;

  var Random = function(seed) {
    this.random = null;
    if (!seed) throw {
      name: "RandomSeedError",
      message: "random_seed_error".l()
    };
    var key = [];
    mixkey(seed, key);
    var arc4 = new ARC4(key);
    this.random = function() {
      var n = arc4.g(chunks);
      var d = startdenom;
      var x = 0;
      while (n < significance) {
        n = (n + x) * width;
        d *= width;
        x = arc4.g(1);
      }
      while (n >= overflow) {
        n /= 2;
        d /= 2;
        x >>>= 1;
      }
      return (n + x) / d;
    };
  };
  // Helper type.
  var ARC4 = function(key) {
    var t, u, me = this, keylen = key.length;
    var i = 0, j = me.i = me.j = me.m = 0;
    me.S = [];
    me.c = [];
    if (!keylen) { key = [keylen++]; }
    while (i < width) { me.S[i] = i++; }
    for (i = 0; i < width; i++) {
      t = me.S[i];
      j = lowbits(j + t + key[i % keylen]);
      u = me.S[j];
      me.S[i] = u;
      me.S[j] = t;
    }
    me.g = function getnext(count) {
      var s = me.S;
      var i = lowbits(me.i + 1); var t = s[i];
      var j = lowbits(me.j + t); var u = s[j];
      s[i] = u;
      s[j] = t;
      var r = s[lowbits(t + u)];
      while (--count) {
        i = lowbits(i + 1); t = s[i];
        j = lowbits(j + t); u = s[j];
        s[i] = u;
        s[j] = t;
        r = r * width + s[lowbits(t + u)];
      }
      me.i = i;
      me.j = j;
      return r;
    };
    me.g(width);
  };
  // Helper functions.
  var mixkey = function(seed, key) {
    seed += '';
    var smear = 0;
    for (var j = 0; j < seed.length; j++) {
      var lb = lowbits(j);
      smear ^= key[lb];
      key[lb] = lowbits(smear*19 + seed.charCodeAt(j));
    }
    seed = '';
    for (j in key) {
      seed += String.fromCharCode(key[j]);
    }
    return seed;
  };
  var lowbits = function(n) {
    return n & (width - 1);
  };

  return Random;
})();
/* Returns a random floating point number between zero and
 * one. NB: The prototype implementation below just throws an
 * error, it will be overridden in each Random object when the
 * seed has been correctly configured. */
Random.prototype.random = function() {
  throw {
    name:"RandomError",
    message: "random_error".l()
  };
};
/* Returns an integer between the given min and max values,
 * inclusive. */
Random.prototype.randomInt = function(min, max) {
  return min + Math.floor((max-min+1)*this.random());
};
/* Returns the result of rolling n dice with dx sides, and adding
 * plus. */
Random.prototype.dice = function(n, dx, plus) {
  var result = 0;
  for (var i = 0; i < n; i++) {
    result += this.randomInt(1, dx);
  }
  if (plus) result += plus;
  return result;
};
/* Returns the result of rolling n averaging dice (i.e. 6 sided dice
 * with sides 2,3,3,4,4,5). And adding plus. */
Random.prototype.aveDice = (function() {
  var mapping = [2,3,3,4,4,5];
  return function(n, plus) {
    var result = 0;
    for (var i = 0; i < n; i++) {
      result += mapping[this.randomInt(0, 5)];
    }
    if (plus) result += plus;
    return result;
  };
})();
/* Returns a dice-roll result from the given string dice
 * specification. The specification should be of the form xdy+z,
 * where the x component and z component are optional. This rolls
 * x dice of with y sides, and adds z to the result, the z
 * component can also be negative: xdy-z. The y component can be
 * either a number of sides, or can be the special values 'F', for
 * a fudge die (with 3 sides, +,0,-), '%' for a 100 sided die, or
 * 'A' for an averaging die (with sides 2,3,3,4,4,5).
 */
Random.prototype.diceString = (function() {
  var diceRe = /^([1-9][0-9]*)?d([%FA]|[1-9][0-9]*)([-+][1-9][0-9]*)?$/;
  return function(def) {
    var match = def.match(diceRe);
    if (!match) {
      throw new Error("dice_string_error".l({string:def}));
    }

    var num = match[1]?parseInt(match[1], 10):1;
    var sides;
    var bonus = match[3]?parseInt(match[3], 10):0;

    switch (match[2]) {
      case 'A':
        return this.aveDice(num, bonus);
      case 'F':
        sides = 3;
        bonus -= num*2;
        break;
      case '%':
        sides = 100;
        break;
      default:
        sides = parseInt(match[2], 10);
      break;
    }
    return this.dice(num, sides, bonus);
  };
})();

// -----------------------------------------------------------------------
// Setup
// -----------------------------------------------------------------------

/* Export our API. */
window.undum = {
  Situation: Situation,
  SimpleSituation: SimpleSituation,

  QualityDefinition: QualityDefinition,
  IntegerQuality: IntegerQuality,
  NonZeroIntegerQuality: NonZeroIntegerQuality,
  NumericQuality: NumericQuality,
  WordScaleQuality: WordScaleQuality,
  FudgeAdjectivesQuality: FudgeAdjectivesQuality,
  OnOffQuality: OnOffQuality,
  YesNoQuality: YesNoQuality,

  QualityGroup: QualityGroup,

  game: game,

  isInteractive: function() { return interactive; },

  // The undum set of translated strings.
  language: {}
};

// -----------------------------------------------------------------------
// Default Messages
// -----------------------------------------------------------------------
var en = {
  terrible: "terrible",
  poor: "poor",
  mediocre: "mediocre",
  fair: "fair",
  good: "good",
  great: "great",
  superb: "superb",
  yes: "yes",
  no: "no",
  choice: "Choice {number}",
  no_group_definition: "Couldn't find a group definition for {id}.",
  link_not_valid: "The link '{link}' doesn't appear to be valid.",
  link_no_action: "A link with a situation of '.', must have an action.",
  unknown_situation: "You can't move to an unknown situation: {id}.",
  existing_situation: "You can't override situation {id} in HTML.",
  erase_message: "This will permanently delete this character and immediately return you to the start of the game. Are you sure?",
  no_current_situation: "I can't display, because we don't have a current situation.",
  no_local_storage: "No local storage available.",
  random_seed_error: "You must provide a valid random seed.",
  random_error: "Initialize the Random with a non-empty seed before use.",
  dice_string_error: "Couldn't interpret your dice string: '{string}'."
};

// Set this data as both the default fallback language, and the english
// preferred language.
undum.language[""] = en;
undum.language["en"] = en;

/* Set up the game when everything is loaded. */
function ready(fn) {
  if (document.readyState != 'loading'){
    fn();
  } else {
    document.addEventListener('DOMContentLoaded', fn);
  }
}

ready(function() {
  // Compile additional situations from HTML
  loadHTMLSituations();

  // Handle storage.
  if (hasLocalStorage()) {
    var erase = document.getElementById("erase");
    erase.onclick = doErase;
    erase.keydown = doErase;
    var save = document.getElementById("save");
    save.onclick = saveGame;
    save.keydown = saveGame;

    var storedCharacter = localStorage[getSaveId()];
    if (storedCharacter) {
      try {
        loadGame(JSON.parse(storedCharacter));
        save.setAttribute('disabled', true);
        erase.setAttribute("disabled", false);
      } catch(err) {
        doErase(true);
      }
    } else {
      save.setAttribute('disabled', true);
      erase.setAttribute("disabled", true);
      startGame();
    }
  } else {
    document.querySelector(".buttons").innerHTML = "<p>"+"no_local_storage".l()+"</p>";
    startGame();
  }

  // handle the link clicks
  document.getElementById("content").addEventListener("click", linkClickHandler, false);

  // Display the "click to begin" message. (We do this in code
  // so that, if Javascript is off, it doesn't happen.)
  showBlock("click_message");

  // Show the game when we click on the title.
  // Note: if you do events with onclick, you have to have only one click event handler.
  // You can use more complex methods if you expect to have more.
  document.getElementById("title").onclick = function() {
    showBlock("content")
    showBlock("content_wrapper");
    showBlock("legal");
    showBlock("tools_wrapper");
    document.getElementById("title").style.cursor = "default";
    hideBlock("click_message");
  };

/*
  // Any point that an option list appears, its options are its
  // first links.
  var optionLinkEvent = function(event) {
    // Make option clicks pass through to their first link.
    var link = $("a", this);
    if (link.length > 0) {
      $(link.get(0)).click();
    }
  };
  items = document.querySelectorAll("ul.options li, #menu li");
  Array.prototype.forEach.call(items, function(element, index){
    element.addEventListener('click', optionLinkEvent);
  });
*/
});
})();
//# 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-----------------------------------------------------------------------\n// Internal Infrastructure Implementations [NB: These have to be\n// at the top, because we use them below, but you can safely\n// ignore them and skip down to the next section.]\n// -----------------------------------------------------------------------\n\n/* Crockford's inherit function */\nFunction.prototype.inherits = function(Parent) {\n  var d = {}, p = (this.prototype = new Parent());\n  this.prototype.uber = function(name) {\n    if (!(name in d)) d[name] = 0;\n    var f, r, t = d[name], v = Parent.prototype;\n    if (t) {\n      while (t) {\n        v = v.constructor.prototype;\n        t -= 1;\n      }\n      f = v[name];\n    } else {\n      f = p[name];\n      if (f == this[name]) {\n        f = v[name];\n      }\n    }\n    d[name] += 1;\n    r = f.apply(this, Array.prototype.slice.apply(arguments, [1]));\n    d[name] -= 1;\n    return r;\n  };\n  return this;\n};\n\n// Feature detection\n\nvar hasLocalStorage = function() {\n  var hasStorage = false;\n  try {\n    hasStorage = ('localStorage' in window) &&\n      window.localStorage !== null &&\n      window.localStorage !== undefined;\n  }\n  catch (err) {\n    // Firefox with the \"Always Ask\" cookie accept setting\n    // will throw an error when attempting to access localStorage\n    hasStorage = false;\n  }\n  return hasStorage;\n};\n\n/// Animations - you can totally redefine these! Fade in and fade out by default.\n/// @param id string or object\nvar showBlock = function(id) {\n  var block = id;\n  if (typeof id === \"string\") {\n    var block = document.getElementById(id);\n  }\n  block.classList.add('show');\n  block.classList.remove('hide');\n  block.style.display = 'block';\n}\n\nvar hideBlock = function(id) {\n  var block = id; // typeof block === \"element\"\n  if (typeof id === \"string\") {\n    var block = document.getElementById(id);\n  }\n  if (typeof id === \"object\") { // probably NodeList\n    if (id.length == 0)\n      return;\n    Array.prototype.forEach.call(id, function(element, index) {\n      element.classList.add('hide');\n      element.classList.remove('show');\n    });\n    return;\n  }\n  if (typeof block.classList === \"undefined\")\n  {\n    console.log(\"Tried to hide an undefined block.\");\n    console.log(id);\n    return;\n  }\n  block.classList.add('hide');\n  block.classList.remove('show');\n}\n\n// Assertion\n\nvar AssertionError = function(message) {\n  this.message = message;\n  this.name = AssertionError;\n};\nAssertionError.inherits(Error);\n\nvar assert = function(expression, message) {\n  if (!expression) {\n    throw new AssertionError(message);\n  }\n};\n\n// Object extention\nvar extend = function(out) {\n  out = out || {};\n  for (var i = 1; i < arguments.length; i++) {\n    var obj = arguments[i];\n\n    if (!obj)\n      continue;\n\n    for (var key in obj) {\n      if (obj.hasOwnProperty(key)) {\n        if (typeof obj[key] === 'object')\n          extend(out[key], obj[key]);\n        else\n          out[key] = obj[key];\n      }\n    }\n  }\n\n  return out;\n};\n","// -----------------------------------------------------------------------\n// Types for Author Use\n// -----------------------------------------------------------------------\n\n/* The game is split into situations, which respond to user\n * choices. Situation is the base type. It has three methods:\n * enter, act and exit, which you implement to perform any\n * processing and output any content. The default implementations\n * do nothing.\n *\n * You can either create your own type of Situation, and add\n * enter, act and/or exit functions to the prototype (see\n * SimpleSituation in this file for an example of that), or you\n * can give those functions in the opts parameter. The opts\n * parameter is an object. So you could write:\n *\n *    var situation = Situation({\n *        enter: function(character, system, from) {\n *            ... your implementation ...\n *        }\n *    });\n *\n * If you pass in enter, act and/or exit through these options,\n * then they should have the same function signature as the full\n * function definitions, below.\n *\n * Note that SimpleSituation, a derived type of Situation, calls\n * passed in enter, act and exit functions AS WELL AS their normal\n * action. This is most often what you want: the normal behavior\n * plus a little extra custom behavior. If you want to override\n * the behavior of a SimpleSituation, you'll have to create a\n * derived type and set the enter, act and/or exit function on\n * their prototypes. In most cases, however, if you want to do\n * something completely different, it is better to derive your\n * type from this type: Situation, rather than one of its\n * children.\n *\n * In addition to enter, exit and act, the following options\n * related to implicit situation selection are available:\n *\n * optionText: a string or a function(character, system,\n *     situation) which should return the label to put in an\n *     option block where a link to this situation can be\n *     chosen. The situation passed in is the situation where the\n *     option block is being displayed.\n *\n * canView: a function(character, system, situation) which should\n *     return true if this situation should be visible in an\n *     option block in the given situation.\n *\n * canChoose: a function(character, system, situation) which should\n *     return true if this situation should appear clickable in an\n *     option block. Returning false allows you to present the\n *     option but prevent it being selected. You may want to\n *     indicate to the player that they need to collect some\n *     important object before the option is available, for\n *     example.\n *\n * tags: a list of tags for this situation, which can be used for\n *     implicit situation selection. The tags can also be given as\n *     space, tab or comma separated tags in a string. Note that,\n *     when calling `getSituationIdChoices`, tags are prefixed with\n *     a hash, but that should not be the case here. Just use the\n *     plain tag name.\n *\n * priority: a numeric priority value (default = 1). When\n *     selecting situations implicitly, higher priority situations\n *     are considered first.\n *\n * frequency: a numeric relative frequency (default = 1), so 100\n *     would be 100 times more frequent. When there are more\n *     options that can be displayed, situations will be selected\n *     randomly based on their frequency.\n *\n * displayOrder: a numeric ordering value (default = 1). When\n*     situations are selected implicitly, the results are ordered\n*     by increasing displayOrder.\n*/\nvar Situation = function(opts) {\n  if (opts) {\n    if (opts.enter) this._enter = opts.enter;\n    if (opts.act) this._act = opts.act;\n    if (opts.exit) this._exit = opts.exit;\n\n    // Options related to this situation being automatically\n    // selected and displayed in a list of options.\n    this._optionText = opts.optionText;\n    this._canView = opts.canView || true;\n    this._canChoose = opts.canChoose || true;\n    this._priority = (opts.priority !== undefined) ? opts.priority : 1;\n    this._frequency =\n      (opts.frequency !== undefined) ? opts.frequency : 1;\n    this._displayOrder =\n      (opts.displayOrder !== undefined) ? opts.displayOrder : 1;\n\n    // Tag are not stored with an underscore, because they are\n    // accessed directy. They should not be context sensitive\n    // (use the canView function to do context sensitive\n    // manipulation).\n    if (opts.tags !== undefined) {\n      if (Array.isArray(opts.tags)) {\n        this.tags = opts.tags;\n      } else {\n        this.tags = opts.tags.split(/[ \\t,]+/);\n      }\n    } else {\n      this.tags = [];\n    }\n  } else {\n    this._canView = true;\n    this._canChoose = true;\n    this._priority = 1;\n    this._frequency = 1;\n    this._displayOrder = 1;\n    this.tags = [];\n  }\n};\n/* A function that takes action when we enter a situation. The\n * last parameter indicates the situation we have just left: it\n * may be null if this is the starting situation. Unlike the\n * exit() method, this method cannot prevent the transition\n * happening: its return value is ignored. */\nSituation.prototype.enter = function(character, system, from) {\n  if (this._enter) this._enter(character, system, from);\n};\n/* A function that takes action when we carry out some action in a\n * situation that isn't intended to lead to a new situation. */\nSituation.prototype.act = function(character, system, action) {\n  if (this._act) this._act(character, system, action);\n};\n/* A function that takes action when we exit a situation. The last\n * parameter indicates the situation we are going to. */\nSituation.prototype.exit = function(character, system, to) {\n  if (this._exit) this._exit(character, system, to);\n};\n/* Determines whether this situation should be contained within a\n * list of options generated automatically by the given\n * situation. */\nSituation.prototype.canView = function(character, system, situation) {\n  if (typeof(this._canView) === \"function\" ) {\n    return this._canView(character, system, situation);\n  } else {\n    return this._canView;\n  }\n};\n/* Determines whether this situation should be clickable within a\n * list of options generated automatically by the given situation. */\nSituation.prototype.canChoose = function(character, system, situation) {\n  if (typeof(this._canChoose) === \"function\") {\n    return this._canChoose(character, system, situation);\n  } else {\n    return this._canChoose;\n  }\n};\n/* Returns the text that should be used to display this situation\n * in an automatically generated list of choices. */\nSituation.prototype.optionText = function(character, system, situation) {\n  if (typeof(this._optionText) === \"function\") {\n    return this._optionText(character, system, situation);\n  } else {\n    return this._optionText;\n  }\n};\n/* Returns the priority, frequency and displayOrder for this situation,\n * when being selected using `system.getSituationIdChoices`. */\nSituation.prototype.choiceData = function(character, system, situation) {\n  return {\npriority: this._priority,\n            frequency: this._frequency,\n            displayOrder: this._displayOrder\n  };\n};\n\n/* A simple situation has a block of content that it displays when\n * the situation is entered. The content must be valid \"Display\n * Content\" (see `System.prototype.write` for a definition). This\n * constructor has options that control its behavior:\n *\n * heading: The optional `heading` will be used as a section title\n *     before the content is displayed. The heading can be any\n *     HTML string, it doesn't need to be \"Display Content\". If\n *     the heading is not given, no heading will be displayed. If\n *     a heading is given, and no optionText is specified (see\n *     `Situation` for more information on `optionText`), then the\n *     heading will also be used for the situation's option text.\n *\n * actions: This should be an object mapping action Ids to a\n *     response. The response should either be \"Display Content\"\n *     to display if this action is carried out, or it should be a\n *     function(character, system, action) that will process the\n *     action.\n *\n * choices: A list of situation ids and tags that, if given, will\n *     be used to compile an implicit option block using\n *     `getSituationIdChoices` (see that function for more details\n *     of how this works). Tags in this list should be prefixed\n *     with a hash # symbol, to distinguish them from situation\n *     ids. If just a single tag or id is needed, it can be passed\n *     in as a string without wrapping into a list.\n *\n * minChoices: If `choices` is given, and an implicit choice block\n *     should be compiled, set this option to require at least\n *     this number of options to be displayed. See\n *     `getSituationIdChoices` for a description of the algorithm by\n *     which this happens. If you do not specify the `choices`\n *     option, then this option will be ignored.\n *\n * maxChoices: If `choices` is given, and an implicit choice block\n *     should be compiled, set this option to require no more than\n *     this number of options to be displayed. See\n *     `getSituationIdChoices` for a description of the algorithm\n *     by which this happens. If you do not specify the `choices`\n *     option, then this option will be ignored.\n *\n * The remaining options in the `opts` parameter are the same as for\n * the base Situation.\n */\nvar SimpleSituation = function(content, opts) {\n  Situation.call(this, opts);\n  this.content = content;\n  this.heading = opts && opts.heading;\n  this.actions = opts && opts.actions;\n\n  this.choices = opts && opts.choices;\n  this.minChoices = opts && opts.minChoices;\n  this.maxChoices = opts && opts.maxChoices;\n};\nSimpleSituation.inherits(Situation);\nSimpleSituation.prototype.enter = function(character, system, from) {\n  if (this.heading) {\n    if (typeof(this.heading) === \"function\") {\n      system.writeHeading(this.heading());\n    } else {\n      system.writeHeading(this.heading);\n    }\n  }\n  if (this._enter) this._enter(character, system, from);\n  if (this.content) {\n    if (typeof(this.content) === \"function\") {\n      system.write(this.content());\n    } else {\n      system.write(this.content);\n    }\n  }\n  if (this.choices) {\n    var choices = system.getSituationIdChoices(this.choices,\n        this.minChoices,\n        this.maxChoices);\n    system.writeChoices(choices);\n  }\n};\nSimpleSituation.prototype.act = function(character, system, action) {\n  var response = this.actions[action];\n  try {\n    response(character, system, action);\n  } catch (err) {\n    if (response) system.write(response);\n  }\n  if (this._act) this._act(character, system, action);\n};\nSimpleSituation.prototype.optionText = function(character, system, sitn) {\n  var parentResult = Situation.prototype.optionText.call(this, character,\n      system, sitn);\n  if (parentResult === undefined) {\n    return this.heading;\n  } else {\n    return parentResult;\n  }\n};\n\n/* Instances of this class define the qualities that characters\n * may possess. The title should be a string, and can contain\n * HTML. Options are passed in in the opts parameter. The\n * following options are available.\n *\n * priority - A string used to sort qualities within their\n *     groups. When the system displays a list of qualities they\n *     will be sorted by this string. If you don't give a\n *     priority, then the title will be used, so you'll get\n *     alphabetic order. Normally you either don't give a\n *     priority, or else use a priority string containing 0-padded\n *     numbers (e.g. \"00001\").\n *\n * group - The Id of a group in which to display this\n *     parameter. The corresponding group must be defined in\n *     your `undum.game.qualityGroups` property.\n *\n * extraClasses - These classes will be attached to the <div> tag\n *     that surrounds the quality when it is displayed. A common\n *     use for this is to add icons representing the quality. In\n *     your CSS define a class for each icon, then pass those\n *     classes into the appropriate quality definitions.\n *\n * One key purpose of QualityDefinition is to format the quality\n * value for display. Quality values are always stored as numeric\n * values, but may be displayed in words or symbols. A number of\n * sub-types of QualityDefinition are given that format their\n * values in different ways.\n */\nvar QualityDefinition = function(title, opts) {\n  var myOpts = extend(opts, {\n    priority: title,\n    group: null,\n    extraClasses: null\n  });\n  this.title = title;\n  this.priority = myOpts.priority;\n  this.group = myOpts.group;\n  this.extraClasses = myOpts.extraClasses;\n};\n/* Formats the value (which is always numeric) into the value to\n * be displayed. The result should be HTML (but no tags are\n * needed). If null is returned, then the quality definition will\n * not be displayed, so if you want an empty value return an empty\n * string. */\nQualityDefinition.prototype.format = function(character, value) {\n  return value.toString();\n};\n\n/* A quality that is always displayed as the nearest integer of\n * the current value, rounded down. Options (in the opts\n * parameter) are the same as for QualityDefinition. */\nvar IntegerQuality = function(title, opts) {\n  QualityDefinition.call(this, title, opts);\n};\nIntegerQuality.inherits(QualityDefinition);\nIntegerQuality.prototype.format = function(character, value) {\n  return Math.floor(value).toString();\n};\n\n/* A quality that displays as an IntegerQuality, unless it is\n * zero, when it is omitted. Options (in the opts * parameter) are\n * the same as for QualityDefinition. */\nvar NonZeroIntegerQuality = function(title, opts) {\n  IntegerQuality.call(this, title, opts);\n};\nNonZeroIntegerQuality.inherits(IntegerQuality);\nNonZeroIntegerQuality.prototype.format = function(character, value) {\n  if (value === 0) {\n    return null;\n  } else {\n    return IntegerQuality.prototype.format.call(\n      this, character, value\n    );\n  }\n};\n\n/* A quality that displays its full numeric value, including\n * decimal component. This is actually a trivial wrapper around\n * the QualityDefinition class, which formats in the same\n * way. Options (in the opts parameter) are the same as for\n * QualityDefinition. */\nvar NumericQuality = function(title, opts) {\n  QualityDefinition.call(this, title, opts);\n};\nNumericQuality.inherits(QualityDefinition);\n\n/* A quality that displays its values as one of a set of\n * words. The quality value is first rounded down to the nearest\n * integer, then this value is used to select a word to\n * display. The offset parameter (optionally passed in as part of\n * the opts object) controls what number maps to what word.\n *\n * The following options (in the opts parameter) are available:\n *\n * offset - With offset=0 (the default), the quantity value of 0\n *     will map to the first word, and so on. If offset is\n *     non-zero then the value given will correspond to the first\n *     word in the list. So if offset=4, then the first word in\n *     the list will be used for value=4.\n *\n * useBonuses - If this is true (the default), then values outside\n *     the range of words will be construced from the word and a\n *     numeric bonus. So with offset=0 and five words, the last of\n *     which is 'amazing', a score of six would give 'amazing+1'.\n *     if this is false, then the bonus would be omitted, so\n *     anything beyond 'amazing' is still 'amazing'.\n *\n * Other options are the same as for QualityDefinition.\n */\nvar WordScaleQuality = function(title, values, opts) {\n  var myOpts = extend(opts, {\n    offset: null,\n    useBonuses: true\n  });\n  QualityDefinition.call(this, title, opts);\n  this.values = values;\n  this.offset = myOpts.offset;\n  this.useBonuses = myOpts.useBonuses;\n};\nWordScaleQuality.inherits(QualityDefinition);\nWordScaleQuality.prototype.format = function(character, value) {\n  var val = Math.floor(value - this.offset);\n  var mod = \"\";\n  if (val < 0) {\n    mod = val.toString();\n    val = 0;\n  } else if (val >= this.values.length) {\n    mod = \"+\" + (val - this.values.length + 1).toString();\n    val = this.values.length - 1;\n  }\n  if (!this.useBonuses) mod = \"\";\n  if (this.values[val] === null) return null;\n  return this.values[val] + mod; // Type coercion\n};\n\n/* A specialization of WordScaleQuality that uses the FUDGE RPG's\n * adjective scale (from 'terrible' at -3 to 'superb' at +3). The\n * options are as for WordScaleQuality. In particular you can use\n * the offset option to control where the scale starts. So you\n * could model a quality that everyone starts off as 'terrible'\n * (such as Nuclear Physics) with an offset of 0, while another that\n * is more common (such as Health) could have an offset of -5 so\n * everyone starts with 'great'.\n */\nvar FudgeAdjectivesQuality = function(title, opts) {\n  WordScaleQuality.call(this, title, [\n    \"terrible\".l(),\n    \"poor\".l(),\n    \"mediocre\".l(),\n    \"fair\".l(),\n    \"good\".l(),\n    \"great\".l(),\n    \"superb\".l()\n  ], opts);\n  if (!('offset' in opts)) this.offset = -3;\n};\nFudgeAdjectivesQuality.inherits(WordScaleQuality);\n\n/* An boolean quality that removes itself from the quality list if\n * it has a zero value. If it has a non-zero value, its value\n * field is usually left empty, but you can specify your own\n * string to display as the `onDisplay` parameter of the opts\n * object. Other options (in the opts parameter) are the same as\n * for QualityDefinition. */\nvar OnOffQuality = function(title, opts) {\n  var myOpts = extend(opts, {\n    onDisplay: \"\"\n  });\n  QualityDefinition.call(this, title, opts);\n  this.onDisplay = myOpts.onDisplay;\n};\nOnOffQuality.inherits(QualityDefinition);\nOnOffQuality.prototype.format = function(character, value) {\n  if (value) return this.onDisplay;\n  else return null;\n};\n\n/* A boolean quality that has different output text for zero or\n * non-zero quality values. Unlike OnOffQuality, this definition\n * doesn't remove itself from the list when it is 0. The options\n * are as for QualityDefinition, with the addition of options\n * 'yesDisplay' and 'noDisplay', which contain the HTML fragments\n * used to display true and false values. If not given, these\n * default to 'yes' and 'no'.\n */\nvar YesNoQuality = function(title, opts) {\n  var myOpts = extend(opts,{\n    yesDisplay: \"yes\".l(),\n    noDisplay: \"no\".l()\n  });\n  QualityDefinition.call(this, title, opts);\n  this.yesDisplay = myOpts.yesDisplay;\n  this.noDisplay = myOpts.noDisplay;\n};\nYesNoQuality.inherits(QualityDefinition);\nYesNoQuality.prototype.format = function(character, value) {\n  if (value) return this.yesDisplay;\n  else return this.noDisplay;\n};\n\n/* Defines a group of qualities that should be displayed together,\n * under the given optional title. These should be defined in the\n * `undum.game.qualityGroups` parameter. */\nvar QualityGroup = function(title, opts) {\n  var myOpts = extend(opts,{\n    priority: title,\n    extraClasses: null\n  });\n  this.title = title;\n  this.priority = myOpts.priority;\n  this.extraClasses = myOpts.extraClasses;\n};\n","/* A system object is passed into the enter, act and exit\n * functions of each situation. It is used to interact with the\n * UI.\n */\nvar System = function() {\n  this.rnd = null;\n  this.time = 0;\n};\n\n/* Removes all content from the page, clearing the main content area.\n *\n * If an elementSelector is given, then only that selector will be\n * cleared. Note that all content from the cleared element is removed,\n * but the element itself remains, ready to be filled again using\n * System.write.\n */\nSystem.prototype.clearContent = function(elementSelector) {\n  var $element;\n  if (elementSelector) $element = document.querySelectorAll(elementSelector);\n  if (!$element) $element = document.getElementById(\"content\");\n  $element.innerHTML = '';\n};\n\n/* Outputs regular content to the page. The content supplied must\n * be valid \"Display Content\".\n *\n * \"Display Content\" is any HTML string that begins with a HTML\n * start tag, ends with either an end or a closed tag, and is a\n * valid and self-contained snippet of HTML. Note that the string\n * doesn't have to consist of only one HTML tag. You could have\n * several paragraphs, for example, as long as the content starts\n * with the <p> of the first paragraph, and ends with the </p> of\n * the last. So \"<p>Foo</p><img src='bar'>\" is valid, but \"foo<img\n * src='bar'>\" is not.\n *\n * The content goes to the end of the page, unless you supply the\n * optional selector argument. If you do, the content appears\n * after the element that matches that selector.\n */\nSystem.prototype.write = function(content, elementSelector) {\n  doWrite(content, elementSelector);\n};\n\n/* Outputs the given content in a heading on the page. The content\n * supplied must be valid \"Display Content\".\n *\n * The content goes to the end of the page, unless you supply the\n * optional selector argument. If you do, the content appears\n * after the element that matches that selector.\n */\nSystem.prototype.writeHeading = function(headingContent, elementSelector) {\n  var heading = document.createElement(\"<h1>\");\n  heading.innerHTML = headingContent;\n  doWrite(heading, elementSelector);\n};\n\n/* Outputs regular content to the page. The content supplied must\n * be valid \"Display Content\".\n *\n * The content goes to the beginning of the page, unless you\n * supply the optional selector argument. If you do, the content\n * appears after the element that matches that selector.\n */\nSystem.prototype.writeBefore = function(content, elementSelector) {\n  doWrite(content, elementSelector, 'prepend', 'before');\n};\n\n/* Outputs regular content to the page. The content supplied must\n * be valid \"Display Content\".\n *\n * When a selector is not specified, this behaves identically to\n * System.prototype.write. If you supply a selector, the content\n * appears as a child node at the end of the content of the\n * element that matches that selector.\n */\n\nSystem.prototype.writeInto = function(content, elementSelector) {\n  doWrite(content, elementSelector, 'append', 'append');\n};\n\n/* Replaces content with the content supplied, which must be valid\n * \"Display Content\".\n *\n * When a selector is not specified, this replaces the entire\n * content of the page. Otherwise, it replaces the element matched\n * with the selector. This replaces the entire element, including\n * the matched tags, so ideally the content supplied should fit\n * in its place in the DOM with the same kind of display element.\n */\n\nSystem.prototype.replaceWith = function(content, elementSelector) {\n  doWrite(content, elementSelector, 'replaceWith', 'replaceWith');\n};\n\n/* Carries out the given situation change or action, as if it were\n * in a link that has been clicked. This allows you to do\n * procedural transitions. You might have an action that builds up\n * the character's strength, and depletes their magic. When the\n * magic is all gone, you can force a situation change by calling\n * this method. */\nSystem.prototype.doLink = function(code) {\n  processLink(code);\n};\n\n/* Turns any links that target the given href into plain\n * text. This can be used to remove action options when an action\n * is no longer available. It is used automatically when you give\n * a link the 'once' class. */\nSystem.prototype.clearLinks = function(code) {\n  var links = document.querySelectorAll(\"a[href='\" + code + \"']\");\n  Array.prototype.forEach.call(links, function(element, index){\n    element.querySelectorAll(\"span\").classList.add(\"ex_link\");\n  });\n};\n\n/* Given a list of situation ids, this outputs a standard option\n * block with the situation choices in the given order.\n *\n * The contents of each choice will be a link to the situation,\n * the text of the link will be given by the situation's\n * outputText property. Note that the canChoose function is\n * called, and if it returns false, then the text will appear, but\n * the link will not be clickable.\n *\n * Although canChoose is honored, canView and displayOrder are\n * not. If you need to honor these, you should either do so\n * manually, ot else use the `getSituationIdChoices` method to\n * return an ordered list of valid viewable situation ids.\n */\nSystem.prototype.writeChoices = function(listOfIds, elementSelector) {\n  if (listOfIds.length === 0) return;\n\n  var currentSituation = getCurrentSituation();\n  var $options = document.getElementById(\"content\").querySelectorAll(\"ul\").classList.add(\"options\");\n  for (var i = 0; i < listOfIds.length; ++i) {\n    var situationId = listOfIds[i];\n    var situation = game.situations[situationId];\n    assert(situation, \"unknown_situation\".l({id:situationId}));\n\n    var optionText = situation.optionText(character, this,\n        currentSituation);\n    if (!optionText) optionText = \"choice\".l({number:i+1});\n    var $option = document.getElementById(\"content\").querySelectorAll(\"li\");\n    var $a;\n    if (situation.canChoose(character, this, currentSituation)) {\n      $a = \"<a href='\"+situationId+\"'>\"+optionText+\"</a>\"\n    } else {\n      $a = \"<span>\"+optionText+\"</span>\";\n    }\n    $option.innerHTML = $a;\n    $options.appendChild($option);\n  }\n  doWrite($options, elementSelector, 'append', 'after');\n};\n\n/* Returns a list of situation ids to choose from, given a set of\n * specifications.\n *\n * This function is a complex and powerful way of compiling\n * implicit situation choices. You give it a list of situation ids\n * and situation tags (if a single id or tag is needed just that\n * string can be given, it doesn't need to be wrapped in a\n * list). Tags should be prefixed with a hash # to differentiate\n * them from situation ids. The function then considers all\n * matching situations in descending priority order, calling their\n * canView functions and filtering out any that should not be\n * shown, given the current state. Without additional parameters\n * the function returns a list of the situation ids at the highest\n * level of priority that has any valid results. So, for example,\n * if a tag #places matches three situations, one with priority 2,\n * and two with priority 3, and all of them can be viewed in the\n * current context, then only the two with priority 3 will be\n * returned. This allows you to have high-priority situations that\n * trump any lower situations when they are valid, such as\n * situations that force the player to go to one destination if\n * the player is out of money, for example.\n *\n * If a minChoices value is given, then the function will attempt\n * to return at least that many results. If not enough results are\n * available at the highest priority, then lower priorities will\n * be considered in turn, until enough situations are found. In\n * the example above, if we had a minChoices of three, then all\n * three situations would be returned, even though they have\n * different priorities. If you need to return all valid\n * situations, regardless of their priorities, set minChoices to a\n * large number, such as `Number.MAX_VALUE`, and leave maxChoices\n * undefined.\n *\n * If a maxChoices value is given, then the function will not\n * return any more than the given number of results. If there are\n * more than this number of results possible, then the highest\n * priority resuls will be guaranteed to be returned, but the\n * lowest priority group will have to fight it out for the\n * remaining places. In this case, a random sample is chosen,\n * taking into account the frequency of each situation. So a\n * situation with a frequency of 100 will be chosen 100 times more\n * often than a situation with a frequency of 1, if there is one\n * space available. Often these frequencies have to be taken as a\n * guideline, and the actual probabilities will only be\n * approximate. Consider three situations with frequencies of 1,\n * 1, 100, competing for two spaces. The 100-frequency situation\n * will be chosen almost every time, but for the other space, one\n * of the 1-frequency situations must be chosen. So the actual\n * probabilities will be roughly 50%, 50%, 100%. When selecting\n * more than one result, frequencies can only be a guide.\n *\n * Before this function returns its result, it sorts the\n * situations in increasing order of their displayOrder values.\n */\nSystem.prototype.getSituationIdChoices = function(listOfOrOneIdsOrTags,\n    minChoices, maxChoices)\n{\n  var datum;\n  var i;\n\n  // First check if we have a single string for the id or tag.\n  if (Object.prototype.toString.call(listOfOrOneIdsOrTags).replace(/^\\[object (.+)\\]$/, \"$1\").toLowerCase() == 'string') {\n    listOfOrOneIdsOrTags = [listOfOrOneIdsOrTags];\n  }\n\n  // First we build a list of all candidate ids.\n  var allIds = {};\n  for (i = 0; i < listOfOrOneIdsOrTags.length; ++i) {\n    var tagOrId = listOfOrOneIdsOrTags[i];\n    if (tagOrId.substr(0, 1) == '#') {\n      var ids = getSituationIdsWithTag(tagOrId.substr(1));\n      for (var j = 0; j < ids.length; ++j) {\n        allIds[ids[j]] = true;\n      }\n    } else {\n      allIds[tagOrId] = true;\n    }\n  }\n\n  // Filter out anything that can't be viewed right now.\n  var currentSituation = getCurrentSituation();\n  var viewableSituationData = [];\n  for (var situationId in allIds) {\n    var situation = game.situations[situationId];\n    assert(situation, \"unknown_situation\".l({id:situationId}));\n\n    if (situation.canView(character, system, currentSituation)) {\n      // While we're here, get the selection data.\n      var viewableSituationDatum =\n        situation.choiceData(character, system, currentSituation);\n      viewableSituationDatum.id = situationId;\n      viewableSituationData.push(viewableSituationDatum);\n    }\n  }\n\n  // Then we sort in descending priority order.\n  viewableSituationData.sort(function(a, b) {\n      return b.priority - a.priority;\n      });\n\n  var committed = [];\n  var candidatesAtLastPriority = [];\n  var lastPriority;\n  // In descending priority order.\n  for (i = 0; i < viewableSituationData.length; ++i) {\n    datum = viewableSituationData[i];\n    if (datum.priority != lastPriority) {\n      if (lastPriority !== undefined) {\n        // We've dropped a priority group, see if we have enough\n        // situations so far, and stop if we do.\n        if (minChoices === undefined || i >= minChoices) break;\n      }\n      // Continue to acccumulate more options.\n      committed.push.apply(committed, candidatesAtLastPriority);\n      candidatesAtLastPriority = [];\n      lastPriority = datum.priority;\n    }\n    candidatesAtLastPriority.push(datum);\n  }\n\n  // So the values in committed we're committed to, because without\n  // them we wouldn't hit our minimum. But those in\n  // candidatesAtLastPriority might take us over our maximum, so\n  // figure out how many we should choose.\n  var totalChoices = committed.length + candidatesAtLastPriority.length;\n  if (maxChoices === undefined || maxChoices >= totalChoices) {\n    // We can use all the choices.\n    committed.push.apply(committed, candidatesAtLastPriority);\n  } else if (maxChoices >= committed.length) {\n    // We can only use the commited ones.\n    // NO-OP\n  } else {\n    // We have to sample the candidates, using their relative frequency.\n    var candidatesToInclude = maxChoices - committed.length;\n    for (i = 0; i < candidatesAtLastPriority.length; ++i) {\n      datum = candidatesAtLastPriority[i];\n      datum._frequencyValue = this.rnd.random() / datum.frequency;\n    }\n    candidatesToInclude.sort(function(a, b) {\n        return a._frequencyValue - b._frequencyValue;\n        });\n    var chosen = candidatesToInclude.slice(0, candidatesToInclude);\n    committed.push.apply(committed, chosen);\n  }\n\n  // Now sort in ascending display order.\n  committed.sort(function(a, b) {\n      return a.displayOrder - b.displayOrder;\n      });\n\n  // And return as a list of ids only.\n  var result = [];\n  for (i = 0; i < committed.length; ++i) {\n    result.push(committed[i].id);\n  }\n  return result;\n};\n\n/* Call this to change the character text: the text in the right\n * toolbar before the qualities list. This text is designed to be\n * a short description of the current state of your character. The\n * content you give should be \"Display Content\" (see\n * `System.prototype.write` for the definition).\n */\nSystem.prototype.setCharacterText = function(content) {\n  var block = document.getElementById(\"character_text_content\");\n  var oldContent = block.innerHTML;\n  var newContent = augmentLinks(content);\n  if (interactive && block.offsetWidth > 0 && block.offsetHeight > 0) {\n    hideBlock(block);\n    block.innerHTML = newContent;\n    showBlock(block);\n    showHighlight(block.parent);\n  } else {\n    block.innerHTML = newContent;\n  }\n};\n\n/* Call this to change the value of a character quality. Don't\n * directly change quality values, because that will not update\n * the UI. (You can change any data in the character's sandbox\n * directly, however, since that isn't displayed). */\nSystem.prototype.setQuality = function(quality, newValue) {\n  var oldValue = character.qualities[quality];\n  character.qualities[quality] = newValue;\n  if (!interactive) return;\n\n  // Work out how to display the values.\n  var newDisplay;\n  var qualityDefinition = game.qualities[quality];\n  if (qualityDefinition) {\n    newDisplay = qualityDefinition.format(character, newValue);\n  } else {\n    // We shouldn't display qualities that have no definition.\n    return;\n  }\n\n  // Add the data block, if we need it.\n  var qualityBlock = document.getElementById(\"#q_\"+quality);\n  if (qualityBlock.length <= 0) {\n    if (newDisplay === null) return;\n    qualityBlock = addQualityBlock(quality).hide().fadeIn(500);\n  } else {\n    // Do nothing if there's nothing to do.\n    if (oldValue == newValue) return;\n\n    // Change the value.\n    if (newDisplay === null) {\n      // Remove the block, and possibly the whole group, if\n      // it is the last quality in the group.\n      var toRemove = null;\n      var groupBlock = qualityBlock.parents('.quality_group');\n      if (groupBlock.find('.quality').length <= 1) {\n        toRemove = groupBlock;\n      } else {\n        toRemove = qualityBlock;\n      }\n\n      toRemove.fadeOut(1000, function() {\n          toRemove.remove();\n          });\n    } else {\n      var valBlock = qualityBlock.find(\"[data-attr='value']\");\n      valBlock.fadeOut(250, function() {\n          valBlock.html(newDisplay);\n          valBlock.fadeIn(750);\n          });\n    }\n  }\n  showHighlight(qualityBlock);\n};\n\n/* Changes a quality to a new value, but also should show a progress bar\n * animation of the change. Removed with the progress bar functionality. */\nSystem.prototype.animateQuality = function(quality, newValue, opts) {\n  this.setQuality(quality, newValue);\n};\n\n/* The character that is passed into each situation is of this\n * form.\n *\n * The `qualities` data member maps the Ids of each quality to its\n * current value. When implementing enter, act or exit functions,\n * you should consider this to be read-only. Make all\n * modifications through `System.prototype.setQuality`, or\n * `System.prototype.animateQuality`. In your `init` function, you\n * can set these values directly.\n *\n * The `sandbox` data member is designed to allow your code to\n * track any data it needs to. The only proviso is that the data\n * structure should be serializable into JSON (this means it must\n * only consist of primitive types [objects, arrays, numbers,\n * booleans, strings], and it must not contain circular series of\n * references). The data in the sandbox is not displayed in the\n * UI, although you are free to use it to create suitable output\n * for the player..\n */\nvar Character = function() {\n  this.qualities = {};\n  this.sandbox = {};\n};\n\n/* The data structure holding the content for the game. By default\n * this holds nothing. It is this data structure that is populated\n * in the `.game.js` file. Each element in the structure is\n * commented, below.\n *\n * This should be static data that never changes through the\n * course of the game. It is never saved, so anything that might\n * change should be stored in the character.\n */\nvar game = {\n\n  // Situations\n\n  /* An object mapping from the unique id of each situation, to\n   * the situation object itself. This is the heart of the game\n   * specification. */\n  situations: {},\n\n  /* The unique id of the situation to enter at the start of a\n   * new game. */\n  start: \"start\",\n\n  // Quality display definitions\n\n  /* An object mapping the unique id of each quality to its\n   * QualityDefinition. You don't need definitions for every\n   * quality, but only qualities in this mapping will be\n   * displayed in the character box of the UI. */\n  qualities: {},\n\n  /* Qualities can have an optional group Id. This maps those\n   * Ids to the group definitions that says how to format its\n   * qualities.\n   */\n  qualityGroups: {},\n\n  // Hooks\n\n  /* This function is called at the start of the game. It is\n   * normally overridden to provide initial character creation\n   * (setting initial quality values, setting the\n   * character-text. This is optional, however, as set-up\n   * processing could also be done by the first situation's\n   * enter function. If this function is given it should have\n   * the signature function(character, system).\n   */\n  init: null,\n\n  /* This function is called before entering any new\n   * situation. It is called before the corresponding situation\n   * has its `enter` method called. It can be used to implement\n   * timed triggers, but is totally optional. If this function\n   * is given it should have the signature:\n   *\n   * function(character, system, oldSituationId, newSituationId);\n   */\n  enter: null,\n\n  /* Hook for when the situation has already been carried out\n   * and printed. The signature is:\n   *\n   * function(character, system, oldSituationId, newSituationId);\n   */\n  afterEnter: null,\n\n  /* This function is called before carrying out any action in\n   * any situation. It is called before the corresponding\n   * situation has its `act` method called. If this optional\n   * function is given it should have the signature:\n   *\n   * function(character, system, situationId, actionId);\n   *\n   * If the function returns true, then it is indicating that it\n   * has consumed the action, and the action will not be passed\n   * on to the situation. Note that this is the only one of\n   * these global handlers that can consume the event.\n   */\n  beforeAction: null,\n\n  /* This function is called after carrying out any action in\n   * any situation. It is called after the corresponding\n   * situation has its `act` method called. If this optional\n   * function is given it should have the signature:\n   *\n   * function(character, system, situationId, actionId);\n   */\n  afterAction: null,\n\n  /* This function is called after leaving any situation. It is\n   * called after the corresponding situation has its `exit`\n   * method called. If this optional function is given it should\n   * have the signature:\n   *\n   * function(character, system, oldSituationId, newSituationId);\n   */\n  exit: null\n};\n","// =======================================================================\n\n// Code below doesn't form part of the public API for UNDUM, so\n// you shouldn't find you need to use it.\n\n// -----------------------------------------------------------------------\n// Internal Data\n// -----------------------------------------------------------------------\n\n/* The global system object. */\nvar system = new System();\n\n/* This is the data on the player's progress that gets saved. */\nvar progress = {\n  // A random seed string, used internally to make random\n  // sequences predictable.\nseed: null,\n      // Keeps track of the links clicked, and when.\n      sequence: [],\n      // The time when the progress was saved.\n      saveTime: null\n};\n\n/* The Id of the current situation the player is in. */\nvar current = null;\n\n/* This is the current character. It should be reconstructable\n * from the above progress data. */\nvar character = null;\n\n/* Tracks whether we're in interactive mode or batch mode. */\nvar interactive = true;\n\n/* The system time when the game was initialized. */\nvar startTime;\n\n/* The stack of links, resulting from the last action, still be to\n * resolved. */\nvar linkStack = null;\n\n// -----------------------------------------------------------------------\n// Utility Functions\n// -----------------------------------------------------------------------\n\nvar getCurrentSituation = function() {\n  if (current) {\n    return game.situations[current];\n  } else {\n    return null;\n  }\n};\n\nvar parse = function(str) {\n  if (str === undefined) {\n    return str;\n  } else {\n    return parseFloat(str);\n  }\n};\n\nvar parseList = function(str, canBeUndefined) {\n  if (str === undefined || str === null) {\n    if (canBeUndefined) {\n      return undefined;\n    } else {\n      return [];\n    }\n  } else {\n    return str.split(/[ ,\\t]+/);\n  }\n};\n\nvar parseFn = function(str) {\n  if (str === undefined) {\n    return str;\n  } else {\n    var fstr = \"(function(character, system, situation) {\\n\" +\n      str + \"\\n})\";\n    var fn = eval(fstr);\n    return fn;\n  }\n};\n\nvar loadHTMLSituations = function() {\n  var $htmlSituations = document.querySelectorAll(\"div.situation\");\n  Array.prototype.forEach.call($htmlSituations, function($situation){\n    var id = $situation.getAttribute(\"id\");\n    assert(game.situations[id] === undefined, \"existing_situation\".l({id:id}));\n\n    var content = $situation.innerHTML;\n    var opts = {\n      // Situation content\n      optionText: $situation.getAttribute(\"data-option-text\"),\n      canView: parseFn($situation.getAttribute(\"data-can-view\")),\n      canChoose: parseFn($situation.getAttribute(\"data-can-choose\")),\n      priority: parse($situation.getAttribute(\"data-priority\")),\n      frequency: parse($situation.getAttribute(\"data-frequency\")),\n      displayOrder: parse($situation.getAttribute(\"data-display-order\")),\n      tags: parseList($situation.getAttribute(\"data-tags\"), false),\n      // Simple Situation content.\n      heading: $situation.getAttribute(\"data-heading\"),\n      choices: parseList($situation.getAttribute(\"data-choices\"), true),\n      minChoices: parse($situation.getAttribute(\"data-min-choices\")),\n      maxChoices: parse($situation.getAttribute(\"data-max-choices\"))\n    };\n\n    game.situations[id] = new SimpleSituation(content, opts);\n  });\n};\n\n\n/* Outputs regular content to the page. Used by write and\n * writeBefore, the last two arguments control what jQuery methods\n * are used to add the content.\n */\n// TODO: this function can append text, prepend text or replace text in selector with the supplied one.\nvar doWrite = function(content, selector) {\n  continueOutputTransaction();\n  var output = augmentLinks(content);\n  var element;\n  if (selector) element = document.querySelector(selector);\n  if (element) {\n    // TODO: scroll to the last position\n    dimensions = element.getBoundingClientRect();\n    console.log(dimensions);\n    window.scroll(0,150);\n    // TODO: scrollStack[scrollStack.length-1] = scrollPoint;*/\n  }\n  if (!element) {\n    document.getElementById('content').innerHTML = output;\n  }\n  else {\n    element.appendChild(output);\n  }\n  /* We want to scroll this new element to the bottom of the screen.\n   * while still being visible. The easiest way is to find the\n   * top edge of the *following* element and move that exactly\n   * to the bottom (while still ensuring that this element is fully\n   * visible.) */\n  /*var nextel = output.last().next();\n    var scrollPoint;\n    if (!nextel.length) {\n    scrollPoint = $(\"#content\").height() + $(\"#title\").height() + 60;\n    } else {\n    scrollPoint = nextel.offset().top - $(window).height();\n    }\n    if (scrollPoint > output.offset().top)\n    scrollPoint = output.offset().top;\n    scrollStack[scrollStack.length-1] = scrollPoint;*/\n};\n\n/* Gets the unique id used to identify saved games. */\nvar getSaveId = function() {\n  return 'undum_'+game.id+\"_\"+game.version;\n};\n\n/* Adds the quality blocks to the character tools. */\nvar showQualities = function() {\n  document.getElementById(\"qualities\").innerHTML = '';\n  for (var qualityId in character.qualities) {\n    addQualityBlock(qualityId);\n  }\n};\n\n/* Fades in and out a highlight on the given element. */\nvar showHighlight = function(domElement) {\n  var highlight = domElement.querySelector(\".highlight\");\n  if (highlight.length <= 0) {\n    highlight = document.createElement(\"<div></div>\").classList.add('highlight');\n    domElement.appendChild(highlight);\n  }\n  showBlock(highlight);\n  setTimeout(function() {\n    hideBlock(highlight);\n  }, 2000);\n};\n\n/* Finds the correct location and inserts a particular DOM element\n * fits into an existing list of DOM elements. This is done by\n * priority order, so all elements (existing and new) must have\n * their data-priority attribute set. */\nvar insertAtCorrectPosition = function(parent, newItem) {\n  var newPriority = newItem.getAttribute('data-priority');\n  var _children = parent.children;\n  if (_children != undefined)\n  {\n    for (var i = 0; i < _children.length; i++) {\n      var child = _children[i];\n      if (newPriority < child.getAttribute('data-priority')) {\n        child.before(newItem);\n        return;\n      }\n    }\n    parent.appendChild(newItem);\n  }\n};\n\n/* Adds a new group to the correct location in the quality list. */\nvar addGroupBlock = function(groupId) {\n  var groupDefinition = game.qualityGroups[groupId];\n\n  // Build the group div with appropriate heading.\n  var groupBlock = document.getElementById(\"quality_group\").cloneNode(true);\n  groupBlock.setAttribute(\"id\", \"g_\"+groupId);\n  groupBlock.setAttribute(\"data-priority\", groupDefinition.priority);\n\n  var titleElement = groupBlock.querySelectorAll(\"[data-attr='title']\");\n  if (groupDefinition.title) {\n    titleElement.innerHTML = groupDefinition.title;\n  } else {\n    if (titleElement.parentNode != undefined)\n    {\n      titleElement.parentNode.removeChild(titleElement);\n    }\n  }\n\n  if (groupDefinition.extraClasses) {\n    for (var i = 0; i < groupDefinition.extraClasses.length; i++) {\n      groupBlock.addClass(groupDefinition.extraClasses[i]);\n    }\n  }\n\n  // Add the block to the correct place.\n  var qualities = document.getElementById(\"qualities\");\n  insertAtCorrectPosition(qualities, groupBlock);\n  return groupBlock;\n};\n\n/* Adds a new quality to the correct location in the quality list. */\nvar addQualityBlock = function(qualityId) {\n  // Make sure we want to display this quality.\n  var qualityDefinition = game.qualities[qualityId];\n  if (!qualityDefinition) {\n    throw new Error(\"Can't display a quality that hasn't been defined: \"+\n        qualityId);\n  }\n\n  // Work out how the value should be displayed.\n  var name = qualityDefinition.title;\n  var val = qualityDefinition.format(\n      character, character.qualities[qualityId]\n      );\n  if (val === null) return null;\n\n  // Create the quality output.\n  var qualityBlock = document.getElementById(\"quality\").cloneNode(true);\n  qualityBlock.setAttribute(\"id\", \"q_\"+qualityId);\n  qualityBlock.setAttribute(\"data-priority\", qualityDefinition.priority);\n  qualityBlock.querySelectorAll(\"[data-attr='name']\").innerHTML = name;\n  qualityBlock.querySelectorAll(\"[data-attr='value']\").innerHTML = val;\n  if (qualityDefinition.extraClasses) {\n    for (var i = 0; i < qualityDefinition.extraClasses.length; i++) {\n      qualityBlock.className.add(qualityDefinition.extraClasses[i]);\n    }\n  }\n\n  // Find or create the group block.\n  var groupBlock;\n  var groupId = qualityDefinition.group;\n  if (groupId) {\n    var group = game.qualityGroups[groupId];\n    assert(group, \"no_group_definition\".l({id: groupId}));\n    groupBlock = document.getElementById(\"g_\"+groupId);\n    if (groupBlock == null || groupBlock.length <= 0) {\n      groupBlock = addGroupBlock(groupId);\n    }\n  }\n\n  // Position it correctly.\n  var groupQualityList = groupBlock.querySelectorAll(\".qualities_in_group\");\n  insertAtCorrectPosition(groupQualityList, qualityBlock);\n  return qualityBlock;\n};\n\n/* Output events are tracked, so we can make sure we scroll\n * correctly. We do this in a stack because one click might cause\n * a chain reaction. Of output events, only when we return to the\n * top level will we do the scroll.\n *\n * However, that leaves the question of where to scroll *to*.\n * (Remember that elements could be inserted anywhere in the\n * document.) Whenever we do a write(), we'll have to update the\n * top (last) stack element to that position.\n */\nvar scrollStack = [];\nvar pendingFirstWrite = false;\nvar startOutputTransaction = function() {\n  if (scrollStack.length === 0) {\n    pendingFirstWrite = true;\n  }\n  // The default is \"all the way down\".\n  scrollStack.push(\n    document.getElementById(\"content\").offsetHeight + document.getElementById(\"title\").offsetHeight + 60\n  );\n};\nvar continueOutputTransaction = function() {\n  if (pendingFirstWrite) {\n    pendingFirstWrite = false;\n    var separator = $(\"#ui_library #turn_separator\").clone();\n    separator.removeAttr(\"id\");\n    $(\"#content\").append(separator);\n  }\n};\nvar endOutputTransaction = function() {\n  var scrollPoint = scrollStack.pop();\n  if (scrollStack.length === 0 && scrollPoint !== null) {\n    if (interactive) {\n      window.scroll(0,scrollPoint);\n    }\n    scrollPoint = null;\n  }\n};\n\n/* This gets called when a link needs to be followed, regardless\n * of whether it was user action that initiated it. */\nvar linkRe = /^([a-z0-9_-]+|\\.)(\\/([0-9a-z_-]+))?$/;\nvar processLink = function(code) {\n  // Check if we should do this now, or if processing is already\n  // underway.\n  if (linkStack !== null) {\n    linkStack.push(code);\n    return;\n  }\n\n  // Track where we're about to add new content.\n  startOutputTransaction();\n\n  // We're processing, so make the stack available.\n  linkStack = [];\n\n  // Handle each link in turn.\n  processOneLink(code);\n  while (linkStack.length > 0) {\n    code = linkStack.shift();\n    processOneLink(code);\n  }\n\n  // We're done, so remove the stack to prevent future pushes.\n  linkStack = null;\n\n  // Scroll to the top of the new content.\n  endOutputTransaction();\n\n  // We're able to save, if we weren't already.\n  document.getElementById(\"save\").setAttribute('disabled', false);\n};\n\n/* This gets called to actually do the work of processing a code.\n * When one doLink is called (or a link is clicked), this may set call\n * code that further calls doLink, and so on. This method processes\n * each one, and processLink manages this.\n */\nvar processOneLink = function(code) {\n  var match = code.match(linkRe);\n  assert(match, \"link_not_valid\".l({link:code}));\n\n  var situation = match[1];\n  var action = match[3];\n\n  // Change the situation\n  if (situation !== '.') {\n    if (situation !== current) {\n      doTransitionTo(situation);\n    }\n  } else {\n    // We should have an action if we have no situation change.\n    assert(action, \"link_no_action\".l());\n  }\n\n  // Carry out the action\n  if (action) {\n    situation = getCurrentSituation();\n    if (situation) {\n      if (game.beforeAction) {\n        // Try the global act handler, and see if we need\n        // to notify the situation.\n        var consumed = game.beforeAction(\n            character, system, current, action\n            );\n        if (consumed !== true) {\n          situation.act(character, system, action);\n        }\n      } else {\n        // We have no global act handler, always notify\n        // the situation.\n        situation.act(character, system, action);\n      }\n      if (game.afterAction) {\n        game.afterAction(character, system, current, action);\n      }\n    }\n  }\n};\n\n/* This function listens on content block to filter out link clicks. */\nvar linkClickHandler = function(event) {\n  if (event.target.tagName.toLowerCase() === 'a') {\n    event.preventDefault();\n    processClick(event.target.href);\n  }\n}\n\n/* This gets called when the user clicks a link to carry out an\n * action. */\nvar processClick = function(code) {\n  var now = (new Date()).getTime() * 0.001;\n  system.time = now - startTime;\n  progress.sequence.push({link:code, when:system.time});\n  return processLink(code);\n};\n\n/* Transitions between situations. */\nvar doTransitionTo = function(newSituationId) {\n  var oldSituationId = current;\n  var oldSituation = getCurrentSituation();\n  var newSituation = game.situations[newSituationId];\n\n  assert(newSituation, \"unknown_situation\".l({id:newSituationId}));\n\n  // We might not have an old situation if this is the start of\n  // the game.\n  if (oldSituation) {\n    // Notify the exiting situation.\n    oldSituation.exit(character, system, newSituationId);\n    if (game.exit) {\n      game.exit(character, system, oldSituationId, newSituationId);\n    }\n  }\n\n  //  Remove links and transient sections.\n  var content = document.getElementById(\"content\");\n  links = content.querySelectorAll(\"a\");\n  Array.prototype.forEach.call(links, function(element, index) {\n    var a = element;\n    if (a.classList.contains('sticky') || a.getAttribute(\"href\").match(/[?&]sticky[=&]?/))\n      return;\n    if (a.getAttribute(\"href\").match(/[?&]transient[=&]?/)) {\n      hideBlock(a);\n    }\n    a.innerHTML = \"<span class='ex_link'>\"+a.innerHTML+\"</span>\";\n  });\n  hideBlock(content.querySelectorAll(\".transient\"));\n  hideBlock(content.querySelectorAll(\"ul.options\"));\n\n  // Move the character.\n  current = newSituationId;\n\n  // Notify the incoming situation.\n  if (game.enter) {\n    game.enter(character, system, oldSituationId, newSituationId);\n  }\n  newSituation.enter(character, system, oldSituationId);\n\n  // additional hook for when the situation text has already been printed\n  if (game.afterEnter) {\n    game.afterEnter(character, system, oldSituationId, newSituationId);\n  }\n};\n\n/* Returns HTML from the given content with the non-raw links\n * wired up. \n * @param content string HTML code \n * @retval string */\nvar augmentLinks = function(content) {\n  // Wire up the links for regular <a> tags.\n  output = document.createElement('div');\n  output.innerHTML = content;\n  var links = output.querySelectorAll(\"a\");\n  Array.prototype.forEach.call(links, function(element, index){\n    var href = element.getAttribute('href');\n    if (!element.classList.contains(\"raw\")|| href.match(/[?&]raw[=&]?/)) {\n      if (href.match(linkRe)) {\n        element.onclick = function(event) {\n          event.preventDefault();\n\n          // If we're a once-click, remove all matching links.\n          if (element.classList.contains(\"once\") || href.match(/[?&]once[=&]?/)) {\n            system.clearLinks(href);\n          }\n\n          processClick(href);\n          return false;\n        };\n      } else {\n        element.classList.add(\"raw\");\n      }\n    }\n  });\n\n  return output.innerHTML;\n};\n\n/* Erases the character in local storage. This is permanent! */\nvar doErase = function(force) {\n  var saveId = getSaveId();\n  if (localStorage[saveId]) {\n    if (force || confirm(\"erase_message\".l())) {\n      delete localStorage[saveId];\n      document.getElementById(\"erase\").setAttribute('disabled', true);\n      startGame();\n    }\n  }\n};\n\n/* Find and return a list of ids for all situations with the given tag. */\nvar getSituationIdsWithTag = function(tag) {\n  var result = [];\n  for (var situationId in game.situations) {\n    var situation = game.situations[situationId];\n\n    for (var i = 0; i < situation.tags.length; ++i) {\n      if (situation.tags[i] == tag) {\n        result.push(situationId);\n        break;\n      }\n    }\n  }\n  return result;\n};\n\n/* Set up the screen from scratch to reflect the current game\n * state. */\nvar initGameDisplay = function() {\n  // Transition into the first situation,\n  document.getElementById(\"content\").innerHTML = \"\";\n\n  var situation = getCurrentSituation();\n  assert(situation, \"no_current_situation\".l());\n\n  showQualities();\n};\n\n/* Clear the current game output and start again. */\nvar startGame = function() {\n  progress.seed = new Date().toString();\n\n  character = new Character();\n  system.rnd = new Random(progress.seed);\n  progress.sequence = [{link:game.start, when:0}];\n\n  // Empty the display\n  document.getElementById(\"content\").innerHTML = '';\n\n  // Start the game\n  startTime = new Date().getTime() * 0.001;\n  system.time = 0;\n  if (game.init) game.init(character, system);\n  showQualities();\n\n  // Do the first state.\n  doTransitionTo(game.start);\n};\n\n/* Saves the character to local storage. */\nvar saveGame = function() {\n  // Store when we're saving the game, to avoid exploits where a\n  // player loads their file to gain extra time.\n  var now = (new Date()).getTime() * 0.001;\n  progress.saveTime = now - startTime;\n\n  // Save the game.\n  localStorage[getSaveId()] = JSON.stringify(progress);\n\n  // Switch the button highlights.\n  document.getElementById(\"erase\").setAttribute('disabled', false);\n  document.getElementById(\"save\").setAttribute('disabled', true);\n};\n\n/* Loads the game from the given data */\nvar loadGame = function(characterData) {\n  progress = characterData;\n\n  character = new Character();\n  system.rnd = new Random(progress.seed);\n\n  // Empty the display\n  document.getElementById(\"content\").innerHTML = \"\";\n  showQualities();\n\n  // Now play through the actions so far:\n  if (game.init) game.init(character, system);\n\n  // Run through all the player's history.\n  interactive = false;\n  for (var i = 0; i < progress.sequence.length; i++) {\n    var step = progress.sequence[i];\n    // The action must be done at the recorded time.\n    system.time = step.when;\n    processLink(step.link);\n  }\n  interactive = true;\n\n  // Reverse engineer the start time.\n  var now = new Date().getTime() * 0.001;\n  startTime = now - progress.saveTime;\n\n  // Because we did the run through non-interactively, now we\n  // need to update the UI.\n  showQualities();\n};\n\n// Internationalization support based on the code provided by Oreolek.\n(function() {\n var codesToTry = {};\n /* Compiles a list of fallback languages to try if the given code\n  * doesn't have the message we need. Caches it for future use. */\n var getCodesToTry = function(languageCode) {\n var codeArray = codesToTry[languageCode];\n if (codeArray) return codeArray;\n\n codeArray = [];\n if (languageCode in undum.language) {\n codeArray.push(languageCode);\n }\n var elements = languageCode.split('-');\n for (var i = elements.length-2; i > 0; i--) {\n var thisCode = elements.slice(0, i).join('-');\n if (thisCode in undum.language) {\n codeArray.push(thisCode);\n }\n }\n codeArray.push(\"\");\n codesToTry[languageCode] = codeArray;\n return codeArray;\n };\n var lookup = function(languageCode, message) {\n   var languageData = undum.language[languageCode];\n   if (!languageData) return null;\n   return languageData[message];\n };\n var localize = function(languageCode, message) {\n   var localized, thisCode;\n   var languageCodes = getCodesToTry(languageCode);\n   for (var i = 0; i < languageCodes.length; i++) {\n     thisCode = languageCodes[i];\n     localized = lookup(thisCode, message);\n     if (localized) return localized;\n   }\n   return message;\n };\n\n // API\n String.prototype.l = function(args) {\n   // Get lang attribute from html tag.\n   var lang = document.querySelector(\"html\").getAttribute(\"lang\") || \"\";\n\n   // Find the localized form.\n   var localized = localize(lang, this);\n\n   // Merge in any replacement content.\n   if (args) {\n     for (var name in args) {\n       localized = localized.replace(\n           new RegExp(\"\\\\{\"+name+\"\\\\}\"), args[name]\n           );\n     }\n   }\n   return localized;\n };\n})();\n\n// Random Number generation based on seedrandom.js code by David Bau.\n// Copyright 2010 David Bau, all rights reserved.\n//\n// Redistribution and use in source and binary forms, with or\n// without modification, are permitted provided that the following\n// conditions are met:\n//\n//   1. Redistributions of source code must retain the above\n//      copyright notice, this list of conditions and the\n//      following disclaimer.\n//\n//   2. Redistributions in binary form must reproduce the above\n//      copyright notice, this list of conditions and the\n//      following disclaimer in the documentation and/or other\n//      materials provided with the distribution.\n//\n//   3. Neither the name of this module nor the names of its\n//      contributors may be used to endorse or promote products\n//      derived from this software without specific prior written\n//      permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND\n// CONTRIBUTORS \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES,\n// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\n// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR\n// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\n// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\n// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR\n// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,\n// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\nvar Random = (function() {\n  // Within this closure function the code is basically\n  // David's. Undum's custom extensions are added to the\n  // prototype outside of this function.\n  var width = 256;\n  var chunks = 6;\n  var significanceExponent = 52;\n  var startdenom = Math.pow(width, chunks);\n  var significance = Math.pow(2, significanceExponent);\n  var overflow = significance * 2;\n\n  var Random = function(seed) {\n    this.random = null;\n    if (!seed) throw {\n      name: \"RandomSeedError\",\n      message: \"random_seed_error\".l()\n    };\n    var key = [];\n    mixkey(seed, key);\n    var arc4 = new ARC4(key);\n    this.random = function() {\n      var n = arc4.g(chunks);\n      var d = startdenom;\n      var x = 0;\n      while (n < significance) {\n        n = (n + x) * width;\n        d *= width;\n        x = arc4.g(1);\n      }\n      while (n >= overflow) {\n        n /= 2;\n        d /= 2;\n        x >>>= 1;\n      }\n      return (n + x) / d;\n    };\n  };\n  // Helper type.\n  var ARC4 = function(key) {\n    var t, u, me = this, keylen = key.length;\n    var i = 0, j = me.i = me.j = me.m = 0;\n    me.S = [];\n    me.c = [];\n    if (!keylen) { key = [keylen++]; }\n    while (i < width) { me.S[i] = i++; }\n    for (i = 0; i < width; i++) {\n      t = me.S[i];\n      j = lowbits(j + t + key[i % keylen]);\n      u = me.S[j];\n      me.S[i] = u;\n      me.S[j] = t;\n    }\n    me.g = function getnext(count) {\n      var s = me.S;\n      var i = lowbits(me.i + 1); var t = s[i];\n      var j = lowbits(me.j + t); var u = s[j];\n      s[i] = u;\n      s[j] = t;\n      var r = s[lowbits(t + u)];\n      while (--count) {\n        i = lowbits(i + 1); t = s[i];\n        j = lowbits(j + t); u = s[j];\n        s[i] = u;\n        s[j] = t;\n        r = r * width + s[lowbits(t + u)];\n      }\n      me.i = i;\n      me.j = j;\n      return r;\n    };\n    me.g(width);\n  };\n  // Helper functions.\n  var mixkey = function(seed, key) {\n    seed += '';\n    var smear = 0;\n    for (var j = 0; j < seed.length; j++) {\n      var lb = lowbits(j);\n      smear ^= key[lb];\n      key[lb] = lowbits(smear*19 + seed.charCodeAt(j));\n    }\n    seed = '';\n    for (j in key) {\n      seed += String.fromCharCode(key[j]);\n    }\n    return seed;\n  };\n  var lowbits = function(n) {\n    return n & (width - 1);\n  };\n\n  return Random;\n})();\n/* Returns a random floating point number between zero and\n * one. NB: The prototype implementation below just throws an\n * error, it will be overridden in each Random object when the\n * seed has been correctly configured. */\nRandom.prototype.random = function() {\n  throw {\n    name:\"RandomError\",\n    message: \"random_error\".l()\n  };\n};\n/* Returns an integer between the given min and max values,\n * inclusive. */\nRandom.prototype.randomInt = function(min, max) {\n  return min + Math.floor((max-min+1)*this.random());\n};\n/* Returns the result of rolling n dice with dx sides, and adding\n * plus. */\nRandom.prototype.dice = function(n, dx, plus) {\n  var result = 0;\n  for (var i = 0; i < n; i++) {\n    result += this.randomInt(1, dx);\n  }\n  if (plus) result += plus;\n  return result;\n};\n/* Returns the result of rolling n averaging dice (i.e. 6 sided dice\n * with sides 2,3,3,4,4,5). And adding plus. */\nRandom.prototype.aveDice = (function() {\n  var mapping = [2,3,3,4,4,5];\n  return function(n, plus) {\n    var result = 0;\n    for (var i = 0; i < n; i++) {\n      result += mapping[this.randomInt(0, 5)];\n    }\n    if (plus) result += plus;\n    return result;\n  };\n})();\n/* Returns a dice-roll result from the given string dice\n * specification. The specification should be of the form xdy+z,\n * where the x component and z component are optional. This rolls\n * x dice of with y sides, and adds z to the result, the z\n * component can also be negative: xdy-z. The y component can be\n * either a number of sides, or can be the special values 'F', for\n * a fudge die (with 3 sides, +,0,-), '%' for a 100 sided die, or\n * 'A' for an averaging die (with sides 2,3,3,4,4,5).\n */\nRandom.prototype.diceString = (function() {\n  var diceRe = /^([1-9][0-9]*)?d([%FA]|[1-9][0-9]*)([-+][1-9][0-9]*)?$/;\n  return function(def) {\n    var match = def.match(diceRe);\n    if (!match) {\n      throw new Error(\"dice_string_error\".l({string:def}));\n    }\n\n    var num = match[1]?parseInt(match[1], 10):1;\n    var sides;\n    var bonus = match[3]?parseInt(match[3], 10):0;\n\n    switch (match[2]) {\n      case 'A':\n        return this.aveDice(num, bonus);\n      case 'F':\n        sides = 3;\n        bonus -= num*2;\n        break;\n      case '%':\n        sides = 100;\n        break;\n      default:\n        sides = parseInt(match[2], 10);\n      break;\n    }\n    return this.dice(num, sides, bonus);\n  };\n})();\n","// -----------------------------------------------------------------------\n// Setup\n// -----------------------------------------------------------------------\n\n/* Export our API. */\nwindow.undum = {\n  Situation: Situation,\n  SimpleSituation: SimpleSituation,\n\n  QualityDefinition: QualityDefinition,\n  IntegerQuality: IntegerQuality,\n  NonZeroIntegerQuality: NonZeroIntegerQuality,\n  NumericQuality: NumericQuality,\n  WordScaleQuality: WordScaleQuality,\n  FudgeAdjectivesQuality: FudgeAdjectivesQuality,\n  OnOffQuality: OnOffQuality,\n  YesNoQuality: YesNoQuality,\n\n  QualityGroup: QualityGroup,\n\n  game: game,\n\n  isInteractive: function() { return interactive; },\n\n  // The undum set of translated strings.\n  language: {}\n};\n\n// -----------------------------------------------------------------------\n// Default Messages\n// -----------------------------------------------------------------------\nvar en = {\n  terrible: \"terrible\",\n  poor: \"poor\",\n  mediocre: \"mediocre\",\n  fair: \"fair\",\n  good: \"good\",\n  great: \"great\",\n  superb: \"superb\",\n  yes: \"yes\",\n  no: \"no\",\n  choice: \"Choice {number}\",\n  no_group_definition: \"Couldn't find a group definition for {id}.\",\n  link_not_valid: \"The link '{link}' doesn't appear to be valid.\",\n  link_no_action: \"A link with a situation of '.', must have an action.\",\n  unknown_situation: \"You can't move to an unknown situation: {id}.\",\n  existing_situation: \"You can't override situation {id} in HTML.\",\n  erase_message: \"This will permanently delete this character and immediately return you to the start of the game. Are you sure?\",\n  no_current_situation: \"I can't display, because we don't have a current situation.\",\n  no_local_storage: \"No local storage available.\",\n  random_seed_error: \"You must provide a valid random seed.\",\n  random_error: \"Initialize the Random with a non-empty seed before use.\",\n  dice_string_error: \"Couldn't interpret your dice string: '{string}'.\"\n};\n\n// Set this data as both the default fallback language, and the english\n// preferred language.\nundum.language[\"\"] = en;\nundum.language[\"en\"] = en;\n\n/* Set up the game when everything is loaded. */\nfunction ready(fn) {\n  if (document.readyState != 'loading'){\n    fn();\n  } else {\n    document.addEventListener('DOMContentLoaded', fn);\n  }\n}\n\nready(function() {\n  // Compile additional situations from HTML\n  loadHTMLSituations();\n\n  // Handle storage.\n  if (hasLocalStorage()) {\n    var erase = document.getElementById(\"erase\");\n    erase.onclick = doErase;\n    erase.keydown = doErase;\n    var save = document.getElementById(\"save\");\n    save.onclick = saveGame;\n    save.keydown = saveGame;\n\n    var storedCharacter = localStorage[getSaveId()];\n    if (storedCharacter) {\n      try {\n        loadGame(JSON.parse(storedCharacter));\n        save.setAttribute('disabled', true);\n        erase.setAttribute(\"disabled\", false);\n      } catch(err) {\n        doErase(true);\n      }\n    } else {\n      save.setAttribute('disabled', true);\n      erase.setAttribute(\"disabled\", true);\n      startGame();\n    }\n  } else {\n    document.querySelector(\".buttons\").innerHTML = \"<p>\"+\"no_local_storage\".l()+\"</p>\";\n    startGame();\n  }\n\n  // handle the link clicks\n  document.getElementById(\"content\").addEventListener(\"click\", linkClickHandler, false);\n\n  // Display the \"click to begin\" message. (We do this in code\n  // so that, if Javascript is off, it doesn't happen.)\n  showBlock(\"click_message\");\n\n  // Show the game when we click on the title.\n  // Note: if you do events with onclick, you have to have only one click event handler.\n  // You can use more complex methods if you expect to have more.\n  document.getElementById(\"title\").onclick = function() {\n    showBlock(\"content\")\n    showBlock(\"content_wrapper\");\n    showBlock(\"legal\");\n    showBlock(\"tools_wrapper\");\n    document.getElementById(\"title\").style.cursor = \"default\";\n    hideBlock(\"click_message\");\n  };\n\n/*\n  // Any point that an option list appears, its options are its\n  // first links.\n  var optionLinkEvent = function(event) {\n    // Make option clicks pass through to their first link.\n    var link = $(\"a\", this);\n    if (link.length > 0) {\n      $(link.get(0)).click();\n    }\n  };\n  items = document.querySelectorAll(\"ul.options li, #menu li\");\n  Array.prototype.forEach.call(items, function(element, index){\n    element.addEventListener('click', optionLinkEvent);\n  });\n*/\n});\n"],"sourceRoot":"/source/"}